In our second time in Nassau we decided to go and spend the day at Paradise Island, 15 minutes by boat from Nassau. There you have the Atlantis hotel where we wanted to stay for the day and visit all the aquariums.
We realized that last time we did not see anything. Atlantis is huge! and you can spend a full day without managing to see it all. It is a sort of disneyland but in aquarium, with all sort of fish and sea life. To get it is 35 usd, but you can go around. We had a nice day there.