Sum, we used Marathon Marina (
http://www.marathonmarinaandboatyard.com/) to lift our boat onto the trailer. They were very careful doing it, have a large storage area. Only charged us $117 to do it, spent 2 hrs pressure washing the bottom and cleaning our dinghy. And it saves the trailer going into the salt water. I think they had the worst bathrooms we encountered on our trip.
The state parks will not allow you to leave a vehicle there and they will not allow you to rinse the boat and trailer off after launching.
We liked the marina at Plantation Key (
http://www.pyh.com/). Very quiet, they are right there to assit in docking the boat and get you into the right slip. The have good free wifi, covered BBQ's picnic tables for free as you can not BBQ on your boat, insurance issues. They have a ramp and storage space, nice slips, best bathrooms and showers. The staff are very nice. Ask for a "houseboat" slip, only has a couple of feet of water but a very good price. It is located in a nice park area with a public beach near by, highly recommended.
Bob