Snorkeling is fun
Check out www.seahorsesailingadventures.com
www.flyingcloud.info
www.stuartcove.com
or the dolphins or sea lions at:
www.dolphinencounters.com
There's also a pirates museum, small zoo (www.ardastra.com), private islands, carriage rides, seqway tours etc.
For casual restaurants, there's the fish fry http://www.fishfrynassau.com/
cricket club http://www.bahamascricket.com/
cafe matisse www.cafe-matisse.com
Poop deck, montegue gardens, green parrot, indigos, capriccios, and so many more.
Enjoy your trip