I second the recommendation for bug spray. A couple of weeks after my honeymoon to Belize ten years ago, my wife pulled a botfly larvae out of my arm and I pulled a botfly larvae out of her scalp. I'm pretty sure that we acquired the larvae when we stayed in an open air cabana. Lesson learned - do not stay in cabanas even if they are more romantic. Please note that, while disgusting, bot fly larvae are pretty clean and typically do not cause infection. Do not cut the larvae out, you will cause more damage than will occur if you find another way to get them out. The larvae need oxygen, so if you put petroleum jelly over the wound, the larvae will start backing out to get the oxygen.

Think about bringing mosquito netting. Bring a watch or travel alarm clock, none of the hotel rooms (other than the Radisson Fort George in Belize City) where we stayed had clocks. Bring a battery powered lantern. When we visited Tikal (in Guatamala), they turned the generators off shortly after nightfall.

Bring some kind of spices. Damn, the food in Belize was the most boring food ever. Which was amazing given that the food in next door Guatamala was some of the best food ever. Bring soap - again this was not typically provided in hotels.

Try Marie Sharps (local version of Tabasco).