Caladesi has boat in camp sites (i.e. you sleep on your boat.) It does not have tent camping sites.
If you can deal with that… It's a beautiful Island. One of the last undeveloped barrier islands in Florida. It's around 650 acres with tons of boardwalks and hiking.
Warm water with not too many waves, so children can play in the water in the summer and cool water in the winter. Great sunsets. Near by restaurants and plenty of little cities to explore within 20 miles!
You can only access this island by boat or ferry from honey moon island. we have always accessed it via kayak from the causeway leading to honeymoon island. there’s lots of great sandbars, and mangrove tunnels for kayaking. At times it’s a pretty much deserted island with lots of wildlife to watch!
These camping “sites” are really just boat slips which allowing you to overnight at the docks on the island. However, the main draw of staying overnight at the dock is that it allow you to get onto the beaches and explore the trails before too many people start arriving on the ferry or other boats.
For your "camping" needs the dock does have power and water hookups and there was a pavilion which had a grill you can use. That why you don't have to try and cook all your meals on the boat. Although, this would depend on your boat as I've seen some which probably have a nicer kitchen than the one I have in my apartment…
The beach is really nice and the trails are interesting, we brought my kayak and went through the mangrove kayak trail which was pretty fun.
But remember, you have to sleep on your boat. No tents, hammocks, etc…. so while it's possible to kayak or canoed to the island from the mainland (i've done it in the past) if you want to "camp" you'll end up having to try and "sleep" on your watercraft…