yourselves - just relax and enjoy the laid back way,
your cossies (costumes) - you wont be able to resist the clear blue water, buy cheap goggles out there and look at the fish
Sun glasses - stops the wrinkles and headaches
mosquito repellent for your skin - nothing spoils a good holiday than the lumps and itching of bites.
Spends - eating out is such a great experience, if you can hire a car and go exploring.
Have a great time. My oldest son flies out for two weeks with his girl friend in September.