Luggage and bags:
Bring whatever style bags you like but I recommend that you bring enought clothes. Most hotels cost a arm and a leg to wash your clothes
Clothing/Shoes/Weather Gear: Bring your swimsuit and beach stuff. Also bring some dress clothes if you plan on going out to the clubs.
Toiletries and Medical Supplies: BRING some sun lotion. I was there for a week and it was sunny, about 80 degrees, and no rain everyday.
Photo Equipment: Bring extra batteries for you video camera unless you can recharge them on 220 volts.
Camping/Beach/Outdoor Gear: Beaches are great and plenty of sunshine.