There are several good naturist campsites on Lake Kissimmee in Osceola County, including
Sturm Island,
Rabbit island,
and Bird Island.

If you have a cabin boat, this lake has a plethora of anchorages. Just determine the expected prevailing wind, and anchor on the leeward side of one of the large islands. Avoid the temptation to anchor in the open area between the weeds and the main shoreline. That's an airboat highway, and they love to run at night.

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