It all depends where you dine. You could eat for real cheap off the street vendors, its safe. Most of the restaurants are moderatly priced,though.With it not being lobster season, I know it will be very cheap to eat, boy, what am I going to eat?
There are alot of diffent tours you could go on besides diving, you could snorkel, beach bbq,fish, visit the ruins and of course bar hop down the beach.