I would suggest Blue Springs State Park. Ramp on the St.Johns river is 5 minutes, Lake Monroe is about 10 minutes, Astor and Crescent are about 45 minutes, Lake Harney is about 35 minutes. Another option would be Rainbow Springs State Park, close to Withlacoochee, about 45 minutes from Sante Fe and Newnans, 45 minutes to gulf coast and right on the prettiest river in Florida. In the Panhandle look around Lake Talquin. One word of caution, you can not by no means double tow. So hopefully you have another vehicle to tow the boat so you do not get the FHP stopping your progress. And also up top is an Archives and Lake Lodging/campgrounds page with many parks listed. I highly recommend the state and county parks.