Accessories
Jewelry: The best way to stretch one outfit over multiple nights is with costume jewelry, and other accessories.
Assorted Pairs of Shoes (3): Shoes take up room, and deciding how many pairs to have is a struggle. One solution is to bring flip-flops or lightweight walking sandals (such as Naot's Kayla style) in various colors, and maybe a dressier pair of heels or shoes for nighttime. Then pack sneakers and water shoes for adventurous excursions.
Beach Bag: We like to have a way to carry our provided beach towel and water (bring your own water bottle to avoid charges). We also recommend bringing a small backpack if you are planning more active excursions, like hikes.
Rain Jacket, Poncho, or Folding Umbrella: There are showers (typically brief) even in the sunny Caribbean.
Sun Hat: You'll be happy to have the extra shade. Baseball hats, straw hats, or rimmed canvas hats all do the trick.
Sunglasses: At sea and on the beach you'll want to protect your eyes, preferably from both UVA and UVB rays. Polarized lenses only reduce glare.