bug spray with some deet content
extra camera memory cards
5-7 tanks or T's, 3 shorts, 1 long pants, 1 cotton shirt with sleeves - if you need to cover from the sun
at least 2 bathing suits (in case one's wet)
toiletries (most places only supply soap)
more ziploc baggies than you'll think you'll need - everything gets damp (keeps your money, food, passport, camera, phone, etc dry, stores liquid toiletries [ever leak shampoo in a suitcase??]- also use large ones to take wet clothing, sandy flip flops or spill-able food products [hot sauce, rum...]home)
take less clothes than you'll think you;ll need
1 walking shoes (like tevas, merrills or keens) or sneakers for jungle day trips
1 regular flip flops (i bring 2 - 1 always ends up wet)
optional: light sundress (you) or tropical weight shirt (son) if you want to do one night fancy on AC, but certainly not necessary.
most importnat - don't forget to bring your biggest smiles and leave your expectations at home. you will have a blast!!