I have stayed in Palm Beach at the John Prince Park in Lake Worth and despite being right in PB County I like the park a lot.
The sites can be close together and the full hookup sites are almost touching each other but again it is cheap and in PB itself.
There are signs as you enter warning to not run over the Iguanas and there are 7 to 8 foot Monsters just laying in the sun all over the place but I didn't see any snakes while I was seeing Iguana! I think they are about equal in the food chain and neither have any natural predators that can help thin the populations.
Otherwise I have stayed at Highland Hammock State Park in Sebring and there is a Rally
there in 2 weeks two. There are certainly Snakes there and many other giant Reptiles and Armadillos and Hogs.
I had an Armadillo in the shower with me last year there but he did not seem to even know I was there,I on the other hand knew he was there!
South Florida just has a lot of Wildlife so camping there will always be filled with slithering creatures I imagine.
In general I don't think they are that aggressive but........
I am not about to suggest you will not cross their paths, I almost always do. They are also so well suited to the environment that I rarely see them until I am about to step on one. That will likely get you noticed by them too.
There is also Lion Country Safari with a Campground and maybe while staying there the Reptile is the least of your worries?!
I love South Florida camping myself.