Weddingbee boards

pack a first aid kit - include stuff for upset tummy, diarrhea, strong headache pills (i get panadine forte that needs a drs prescription), antibiotic cream, antibiotics,  suncream and some UTI powders for just in case (you mix it with water and drink - i dont know what the US sells over the counter)

scuba booties or beach walker shoes as some beaches have crushed coral on them and its difficult to walk on that and if you are planning on doing a lot of snorkeling consider packing your own mask and snorkel and maybe booties and fins, although resorts usually have these for guests you dont know what quality of equip you will get - we are scuba divers so we never go without these

for your carry on - pack a small pack of toothpaste/brush, deodarant and fascial wipes to freshen up on the way

take an empty bottle of water on the plane - has to be empty so you have no security issues and once you are on the plane refill it and drink plenty while flying, this way you dont have to ask for those silly tiny cups of water

if you are planning on going into the jungles pack lightweight long sleever shirt, pants and hat

finally, when in the water - dont walk on the coral