Mesmerizing Ile aux Cerf: Speed Boat, GRSE, Lunch & Undersea walk (Full Day)

Mauritius saves its biggest splash for the lagoon. This full-day trip combines a fast speedboat ride with white beaches, an undersea walk, a barbecue lunch, and a look at Grand River South East Waterfall. I especially like the small group size, capped at 12 people, and the hotel pickup, which takes much of the day’s transport work off your hands.

The undersea walk is the main reason to book, while the beach barbecue gives the day a relaxed center. The main caution is that Ile aux Cerfs can feel commercial and busy, and some beach facilities cost extra. The opening boat transfers may also feel a little disorderly as different groups change boats for different activities.

The day’s best features at a glance

• A speedboat from Trou d’Eau Douce: The trip begins in a real fishing village, then heads across the east coast lagoon at a lively pace.
• A 15-minute undersea walk: You wear the required equipment and walk among fish and coral in the lagoon.
• A beach barbecue at Islet Margenie: Grilled chicken, fish, salad, drinks, beer, wine, and local rum make this more than a quick picnic.
• A short look at GRSE Waterfall: The boat travels up Grand River South East, with possible views of monkeys and fruit bats.
• A small group of no more than 12: This matters when you need help with transfers, equipment, or timing.
• Hotel pickup and drop-off: Pickup is offered across Mauritius, though the exact time depends on your location.

Starting at Trou d’Eau Douce at 8:30

The day begins with hotel pickup, followed by a drive to Trou d’Eau Douce on Mauritius’s east coast. The drive from your hotel will vary, so do not treat the published start time as the moment you step onto the boat. The operator gives a pickup time based on your location.

Trou d’Eau Douce is a fishing village and the launch point for the speedboat. This is a useful place to begin because you are not simply whisked from a resort beach into a packaged water activity. You get a brief look at one of the island’s working coastal communities before the leisure part of the day begins.

The boat transfer is one of the more enjoyable parts of the outing. You travel over the clear lagoon toward Ile aux Cerfs, with palm trees, pale sand, and bright turquoise water appearing as the island comes closer. A speedboat gives you a more exciting ride than a slow transfer boat, but it also means wind, spray, and a bumpier trip.

Bring a towel and spare clothing. That advice is especially important here because you have several chances to get wet, including the boat ride, swimming, and the undersea activity. Pickup and drop-off are included, which is a meaningful part of the price if you are staying away from the east coast.

Ile aux Cerfs: postcard beaches with a practical catch

Ile aux Cerfs is the visual star of the day. Its white sand and turquoise lagoon make an immediate impression, and you have time to swim, sunbathe, and look around rather than simply stopping for a quick photograph.

The beach portion lasts about four hours, although the exact flow depends on the activity schedule. That gives you room to do more than one thing. You can swim, sit by the water, take a walk, or use available paid activities such as parasailing or a glass-bottom boat.

Here is the catch: not every part of the island feels like an untouched tropical retreat. Some areas are geared toward day visitors, and beach comforts such as sunbeds and shades may cost extra. If your idea of a perfect island is a quiet, empty beach with nothing for sale, this stop may disappoint.

I would treat the island as a pleasant base for the included activities, not as the sole reason to pay for the tour. The water and sand are lovely, but the package makes better sense when you value the speedboat, undersea walk, lunch, waterfall visit, and transportation together.

Snorkeling is another point to clarify before booking. The package includes swimming and the undersea walk, but snorkeling is not necessarily provided as a free activity. One account specifically found that snorkeling required payment. If snorkeling is your main goal, ask the operator exactly what equipment and access are included.

The undersea walk is the main event

The undersea walking session lasts about 15 minutes, although the wider stop at Ile aux Cerfs is listed as two hours for this activity and lunch transition. You walk along the coral reef in the lagoon while looking at fish and other marine life.

This is different from snorkeling. You do not need to spend the whole time keeping your face in the water, and the format can appeal to people who want to see the reef without being strong swimmers. The experience is built around slow movement, looking around, and watching fish in their natural setting.

The activity also has limits. One instructor may be handling several people at once, and that can make the first few minutes feel unsettling if you are nervous in water. Clear instructions and close supervision matter here. Keep your own comfort in mind rather than feeling pressured to continue simply because the activity is included.

Children are not automatically included in the undersea walk. The activity depends on the parents’ decision, and children pay only for their speedboat seat. Ask for the exact arrangements before booking if you are bringing children, especially if the undersea walk is the reason for choosing this package.

People with food allergies or an illness should advise the operator in advance. A vegetarian meal is available if requested ahead of time. Those details are easy to overlook, but they can make a long day on the water much more comfortable.

Islet Margenie turns lunch into a proper break

Around noon, the group heads to Islet Margenie for a freshly prepared barbecue lunch. The menu includes grilled chicken, fish, salad, and other items, with unlimited soft drinks, water, beer, wine, and local rum listed as part of the meal.

The setting is a major part of the appeal. You eat by the sea, then have time to swim afterward instead of being rushed straight back onto the boat. That pause gives the day a useful rhythm: activity in the morning, lunch and water time at midday, then the waterfall visit later.

The food is not presented as a formal restaurant meal, and it should not be judged by that standard. This is a casual island barbecue. Still, grilled chicken, fish, salad, and drinks included in the price make the package easier to justify than an excursion where lunch is a basic sandwich and a bottle of water.

The unlimited alcohol deserves a practical note. Beer, wine, and local rum are included, but the day continues with boat travel and a return transfer. Enjoy the drinks sensibly, especially before the speedboat ride back. Water is included too, so use it.

If you need a vegetarian meal, say so when booking. The same goes for allergies. Do not assume the crew will be able to adjust the menu at the last moment.

Grand River South East Waterfall by boat

The final major stop is Grand River South East Waterfall, often shortened to GRSE. The river is the longest in Mauritius, and it reaches the coast through a wooded river mouth that you can approach by boat.

The river ride offers a change of scenery after the open lagoon and beach. Instead of white sand and wide ocean views, you see riverbanks and large old trees. Keep an eye out for monkeys moving through the branches and Mauritian fruit bats resting high above the water. These sightings are possible, not guaranteed, so enjoy the river setting even if the animals remain hidden.

The waterfall stop lasts about an hour. The boat ride back includes fast turns and high-speed runs, which can be fun for people who enjoy a bit of adrenaline. If you prefer a calm cruise, tell the crew if you are uncomfortable with sharp spins or a rough ride.

One limitation is that the waterfall visit may feel brief. The boat reaches the waterfall, gives you the view, and returns rather than offering a long walk or extended time on land. Some people will find that enough; others may wish for more time to take photographs or watch the river.

What the $139.37 price really covers

At $139.37 per person, this is not the cheapest way to see Ile aux Cerfs. The value depends on how many included pieces you would otherwise arrange separately.

You are paying for hotel transportation, a speedboat journey, the island stop, an undersea walking session, lunch, unlimited listed drinks, and the GRSE Waterfall visit. The maximum group size of 12 is also useful. A smaller group can make boat changes and activity instructions less frustrating than a large coach-and-boat operation.

The price is strongest for someone who wants a complete day with little planning. You do not need to find your own way to Trou d’Eau Douce, arrange a separate boat, locate lunch, and organize the waterfall trip. The package also works well for a first visit to Mauritius when you want a broad sample of the east coast.

The value is weaker if you mainly want a quiet beach day. You may end up paying for activities and transport you do not care about, while still facing extra charges for some beach facilities. It is also not ideal if you want a long, serious snorkeling session or an extended waterfall walk.

The tour is often booked about 20 days ahead, so leaving it until the last minute may not work during busy periods. Confirmation is provided at booking, and at least two people are required for a reservation.

Timing, boat changes, and what to pack

Expect a seven to eight-hour day. That includes the hotel pickup, drive to Trou d’Eau Douce, multiple boat movements, beach time, lunch, the river visit, and the return journey.

The boat changes are worth understanding before you go. Different activities may use different boats, and the start can involve moving between vessels. The process may feel like organized chaos rather than a perfectly staged departure. Stay close to your guide, keep your belongings together, and listen carefully when the group is called.

A small group helps, but it does not remove all island-tour unpredictability. Weather, water conditions, and the timing of other activities can affect the pace. The operator uses a certified guide, and the guide meets you at pickup, but the exact pickup time varies by hotel.

Pack:

• A towel
• Spare clothes
• Swimwear
• Protection for personal items that should not get wet
• Any required medication
• Advance notice for vegetarian meals or food allergies

The activity is available by mobile ticket, and most people can participate. The operator states that it requires good weather. In the event of a cyclone or torrential rainfall alert, the operator may cancel and provide a different date or a full refund.

Who will enjoy this day most

I would recommend this tour to couples, families with older children, and first-time visitors who want several east coast experiences in one outing. It suits you if you like switching between fast boat rides, swimming, an easy marine activity, a casual barbecue, and short sightseeing stops.

It is also a good match for people who value hotel pickup. Mauritius is not enormous, but getting between resort areas and the east coast still takes planning. Having transport arranged can save time and reduce the risk of missing the boat.

Families should check the undersea walk rules before paying. Children pay only for the speedboat seat, and the sea walk is subject to parental choice. That can make the pricing and activity plan less straightforward for a family group.

I would be more cautious about booking if you want peace and quiet, long snorkeling time, luxury dining, or a carefully paced nature tour. The island may have paid beach facilities, the activity changes can feel busy, and the waterfall visit is relatively short.

The overall rating is 4.1 out of 5 from 22 ratings, which fits the experience as described: the best parts are genuinely strong, but the day is not free of rough edges. The most praised elements are the speedboat, undersea walk, barbecue lunch, beach setting, and reliable pickup. The clearest complaints concern the handling of the undersea walk, limited free beach comforts, and not having enough time or freedom in some areas.

Should you book the Ile aux Cerfs day?

Book it if you want an active, all-in-one east coast day and the undersea walk appeals to you. The combination of boat travel, reef viewing, lunch, drinks, and GRSE Waterfall gives you solid coverage for the price, especially with hotel transfers and a group limited to 12.

Skip it if you mainly want a secluded beach or a dedicated snorkeling trip. In that case, the commercial sections of Ile aux Cerfs, possible extra charges for beach equipment, and short underwater session may not meet your expectations.

For most first-time visitors, I see this as a good-value introduction to the east coast, provided you arrive with realistic expectations. Bring spare clothes, request dietary arrangements early, confirm the children’s activity details, and accept that the day may be lively rather than perfectly orderly.

FAQ

Where does the tour begin?

The tour starts with pickup from your Mauritius hotel, followed by transport to Trou d’Eau Douce on the east coast.

What time does the tour start?

The listed start time is 8:30 am. Your exact pickup time may vary according to your hotel location.

How long does the experience last?

The full experience lasts approximately seven to eight hours.

How many people can join the tour?

The tour has a maximum of 12 people. A minimum of two people is required per booking.

Is hotel pickup included?

Yes. Round-trip hotel transfers are included, with pickup available from accommodations anywhere on Mauritius.

Is lunch included?

Yes. Lunch is a freshly prepared barbecue at Islet Margenie. The menu includes grilled chicken, fish, salad, and other items.

Are drinks included with lunch?

Yes. Included drinks are soft drinks, water, beer, wine, and local rum.

Is the undersea walk included for children?

Children are not automatically included in the undersea walk. The activity depends on their parents, and children pay only for their speedboat seat.

Is a vegetarian meal available?

Yes. A vegetarian option is available, but you should advise the operator when booking.

What happens if bad weather cancels the tour?

The experience requires good weather. If the operator cancels because of poor weather, you can receive a different date or a full refund. You can also cancel for a full refund up to 24 hours before the start time. Cancellations within 24 hours are not refunded.