Just like a previous response, I would highly reccommend the dolphin swim in Nassau. It was the most amazing thing I have done in my 42 years. You must book it yourself because Disney does not use this excursion. They have a different Dolphin encounter that is not nearly as extensive, but more expensive. If you need help booking it E-Mail me and I will send you all the particulars. We also did the snorkling in Castaway, a real let-down. There were not many fish and the few we saw were identical. There is so much to do on Castaway you don't really need an excursion, although the banana boat ride is a blast and doesn't take much time.