John Pennekamp State Park, Key Largo, is one of the few that have full hookups.
Bluewater Key is the best park close to Key West. That said, they have two DIFFERENT web sites... ".com" amd ".net". They have different pricing on the same type lots. Bluewaterkey.com offers rates at $130/night while Bluewaterkey.net offers them for $60/night. Choose your poison.....
If you want a visual of the keys and campsites, check out my blog below for pictures.....Dennis
Key West - Scroll down for infoSouth through the KeysBluewater Key