I've been there a couple of times on cruises. Once I took a tour of the island trip offered by the cruise line contractor and really enjoyed it. On another visit I rode a water taxi from the cruise dock to Atlantis, which was an interesting narrated trip (passed Oprah's new mansion) and then at Atlantis there is the aquarium (pricey) and if you are interested in gambling there is a small casino. For shopping there is a market at the cruise docks.
Have a good time.