We have had luck here:
(They do book a year in advance, around the holidays & winter, but may have a spot or two).
RV Sites in Cudjoe Key, FL | Waterfront Keys Realty, Inc.
Gated community,marina, pool over looking the water, hot-tubs,
Mix of vacation rentals, RV slots throughout the community.
Not as much $$$ as the bigger RV parks (where you are on top of each other).
Markiemark