Jim Shoe wrote:
Something to keep in mind. The keys are a string of coral reefs. Unless an RV park imports sand to make an artificial beach, wear shoes when you go in the water. Coral is very sharp.
That's not always the case. The state parks don't build up the beaches and you can wade out a long way on sand. I think the bottoms may have more coral in the lower keys than the upper keys.
The bottoms are covered about 60% in sea grass. You can see this from the surface just pick the clear areas for wading since there are all sorts of critters living in that grass: sponges, fish and sea urchins to name a few. And you absolutely do not want to step on a sea urchin with a bare foot.
But those grass beds are great to snorkel over so you can see all the critters.
Definitely go on at least one snorkeling trip on a dive boat. They'll take you out to the reefs and it's a great trip. They'll rent snorkeling gear to you if you need it.
Even in the summer the sea influence usually keeps the Keys from getting too hot. We often go down in July or August. There are fewer tourists and it's a lot less hectic. Besides you will have a difficult time making reservations at a campground during the season (Dec-Apr) unless you do it well in advance. And they really run the prices up too.