Croc,
Bora Bora - short for not much to do here. Pick from three.
You can go out with guides to get in the water and feed the sharks. They keep the sharks interested in what ever it is they feed to the sharks and you stay behind a a rope marker placed a "safe distance" away from the frenzied sharks as you watch through your mask breathing through your snorkel.
For those that don't like sharks, you can rent an old Vespa and ride circles around the island.
The top past time would be to stay with Croc having several of your favorite island drink, bask in the sun and take an occasional dip in the warm clear water.
Enjoy