Here's a couple of replies I have made to dolphin encounter questions. PM me if you have any other questions.
We were in Nassau last summer on a
Disney cruise and we did the dolphin encounter and had a BLAST (it's worth every penny) Make sure and plan on staying all day. There are 2 boats that go back and if you take the later one you have time to eat a leisurely lunch and do some snorkeling. Bring your own gear if you have it or you can rent it on the island. Hope you meet the cutest dolphin, Stormy.
My daughter and I went on the Dolphin Encounter last July. It was WONDERFUL!!! Worth every penny. I took a video recorder and a camera, but was unable to use them. They REALLY discourage the use of your own cameras, and to ensure you put it away the first thing they do is have the dolphin (ours was named Stormy) go around the circle of people tail side out of the water and DRENCH everyone. I quickly put my cameras away. That being said I bought the video and pics they took. Really cute ones with dolphin hugs, etc. They are darling! If my scanner worked I would post a few. Warning: they are very expensive, like $130 for everything and they do NOT take your top of the world card (or whatever it's called card) Take your mastercard or cash. Some people took underwater cameras and may have gotten a few good shots, but when will you ever be there again? We still have ours pictures on our fridge and kitchen counter.