I'd check out the lodging link that is at the top of the page. One of your first decisions will be whether you want to be up north, and take water taxis to town, or south of town, where you can rent golf carts or take regular cabs.
I've never been in July, but it's rainy season, I'm guessing there are mosquitos. Not so bad on the beach, it's usually breezy enough to keep them at bay.