Luggage and bags:
Unless you are high maintenance and require a full set of luggage, you will have enough room for all your gear in a regular sized backpack, maybe an extra backpack for purchases or whatever else you may feel the need to bring back.
Clothing/Shoes/Weather Gear: Do I really need to say multiple bathing suits? Girls, two to three pairs of bathing suits/bikinis is a great start. Guys, a couple of board shorts or Speedo's (if you feel compelled to do so) is awesome as well. Flip flops, tennis shoes, and socks should take care of your feet and of course, you will need to pack a hoodie because it does get quite chilly at night, even in the summer!
Toiletries and Medical Supplies: Sunscreen, tanning oil (big FU to UV rays), mosquito repellent if you tend to always get bitten, some lotion, and all other run of the mill toiletries and med supplies will do. Ease off on the perfume girls, a nice body spray VS or Bath & Body do a nice job and guys, you needn't douse cologne all over yourselves a nice clean scent is always best.
Photo Equipment: Digital camera, camcorder, regular camera, whatever...just make sure you bring enough film, memory cards, CHARGERS, etc...because this kind of a thing can get a bit expensive and hard to find at reasonalbe prices of or good quality. It's better to be prepared.
Miscellaneous: I will be doing more updating as soon as I get some R&R time from all my activities. So until then, I'll say goodbye!