I've always been DIY in Florida. MY favorite place is the Everglades- you can go in through Chokoloskee, just south of Naples, or drive across Alligator Alley ( watch your backcast in car traffic and fish the canal), to Miami area, turn south to Homestead, and go into Flamingo, my favorite. You can camp and rent canoes/kayaks either place.
If the weather is cold, go sight seeing- the fishing sucks. The fishing gets good when it's hot and muggy. At Flamingo you can paddle out onto the bay and look for fish, or cast to the backside of mudding rays. If you paddle back to Coot Bay, the possibilities are really fun- snook, reds and baby tarpon, with an occasional full-sized tarpon for good measure. Fish the edges like you're bass fishing with top water stuff, or drop subsurface stuff along the mangroves or other structure. And keep an eye out for passing fish in open water- I've seen tarpon working on several occasions, and twice hooked huge fish that promptly showed me what I didn't know about dealing with 100lb + fish in a canoe by myself.
You can also head out the keys, and try for campsites (first come first serve) on the FL State Park locations out there- Long Key, Bahia Honda, and I think there's one other. It's flats fishing, that gets hit pretty hard by lots of people. Not really my thing, but a friend of mine loves it.