Good idea to focus on the little things like TWO atm cards in case something happens to one of them. Plus lots of chapsticks and zip lock baggies (for cell phone) and TONS of lighters. When I go out, I bring two lighters, one for me to use and the other to replace the first one that gets lost. Extra charger cord in case god forbid something happens to the first one, and I also find it convenient to bring a big pool towel. Also, this past time I brought my own high-quality pillow as a carry-on, which was awesome for the flight; sometimes hotel pillows are not comfortable enough (or the pillow case is worn out, so it's a good idea. Also tin foil and paper plates and red drinking cups come in handy -- those items are expensive in Negril.