Hard to say unless you tell us what you are looking for. Florida has outstanding state parks. They are, IMO, probably the best in the country. Parks near the beach are hard to get into, no surprise, so if you want to stay in some of them--make reservations well ahead of time.
There are lots of commercial parks that are usually easy to get into.
I'd divide north Florida into beach country--which means the east coast in the peninsula, and spring country being the interior part of the state. There are a lot of major springs (Manatee, Rainbow, Homosassa and others) most located inside a state park, in Florida. They are very nice places to camp. That part of the west coast doesn't have good beaches but does have good fishing--if you have or rent a boat.
The southern border of north Florida is theme park country which starts in Tampa with Busch Gardens, runs thru Orlando with a lot of parks and sort of dies at Cocoa Beach with the Kennedy Space center.
BK