One of my favorite places.
I've been there 5 or 6 times in the last 10 years. Even when the camping area is full a few minutes walk will take you to a deserted section of the beach. The water is wonderful and the beach goes on for miles. There is great bird watching: ibis, spoonbills and egrets, ospreys, I once saw a great horned owl right in the campground. All kinds of wildlife viewing as well: dolphins and manatees, skates and rays, feral hogs, alligators, gopher tortoises and other smaller reptiles. There is good shelling, good fishing, good stargazing. Since hurricane Charley there is now very little shade on the island. The island has been restored to it's natural "low growing" state. Tents and cabins can be hot in the middle of the day. Non-swimmers may have trouble cooling off sufficiently in the hotter months. You may want to bring a tarp/sun shelter to provide shade. You need to bring everything with you as all there is to purchase is ice. (Which you will want.) There is running water and flush toilets but only cold showers. No electricity. The bugs can be bad. Do not go without plenty of DEET and sunscreen of course. Last time I took a "all natural" bug dope and boy was I sorry. Much more bothered by bugs than during "pre-Charley" trips. My companion was also bothered even with DEET. I was able to get cell phone reception with my provider so family could leave messages for me in case of emergency.