My husband and I went on the half day trip with dolphins, snorkelling, and Ile aux Benitiers BBQ. I highly recommend Dolswim, both because of the quality of the experience and because of the fact that they emphasize a respectful attitude towards the dolphins. These are wild dolphins in their natural environment! Staff are helpful, friendly, and knowledgeable; you are told about the dolphins beforehand, there is a safety talk, and they make sure that everyone is comfortable in the water. We saw a few dozen spinner dolphins, some of which jumped out of the water and spun about, and we also were lucky enough to have a few curious bottlenose dolphins come over to check us out. Each of the 4 couples on our boat got 2 chances to go in the water. I was satisfied and this is easily the best excursion of the several we did.
We paid an extra fee for Dolswim to send a car to our hotel in the north of the island to pick us up, which was less than the hotel taxis would have charged us. It was a very early morning - we were picked up at 6am. When we arrived there was a small but tidy office with changing rooms, a toilet, and a shower. Guests were split onto various boats and we headed out. Ours was one of the first boats out but as the morning went on I counted nearly 20 boats, and this is something I would like to draw attention to. As mentioned these are wild dolphins in their natural habitat, and while Dolswim made sure to follow the rules (staying to the side of them as much as possible, not chasing right behind them, not going to the middle of a pod, etc) some of the other boats did not. Towards the end of the dolphin watching part of the morning, you started to get the sense that the dolphins were feeling harassed by the number of boats in the bay. Dolswim apparently goes to different areas to avoid bothering the same dolphins day after day, but I don't know about other companies.
The BBQ lunch was quite tasty. A few notes about the Ile aux Benitiers - there are no toilets, so be prepared to go in the bushes or in the sea. There are also quite a few people trying to sell you things, but the Dolswim staff warned us of this before landing which was good. This got pretty annoying as there is a steady stream of people coming up to your table trying to offer you necklaces, sarongs, carved dodos, reggae CDs, etc. They greet you in a friendly manner before opening their bags of things to sell but if you tell them no thank you they will leave.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.