Great Stirrup Cay & Nassau

DH and I are cruising with NCL in April and 2 of our stops are Great Stirrup Cay and Nassau. I did not see anything on NCL's excurisons list that they offered that I thought we would want to do. Can you recommend something? I thought that being we had the 2 other stop filled with things to do, that we would just walk around and sight see, and if we saw something we wanted to do, then we would do it, unless some of my CC friends can recommend something.:D Thank you for all your help in advance

I'm going on the same cruise in March. Do you think most people will get off the ship in Fla? It seems like such a short amount of time to see Nasa, etc...