You should plan to bring a carry-on bag with all important documents (a valid passport, e-ticket, insurance card, and Breakaway Traveler Guidelines signed by you and your parent/guardian), a day's worth of extra clothes, something to keep you entertained like a book or iPod, and remember no liquids over 100mL.
In your checked luggage, remember that you do NOT need to pack your whole closet. Lots of bathing suits, board shorts, T's, underwear, and a sweater will do. Don't forget your theme night swag, toiletries, and of course, sunscreen!
Travelers should be aware of standard airline limitations of 50 lbs per bag for each passenger. To make traveling easier, we recommend traveling with only one suitcase per passenger.