Blackwater River State Park is a hidden gem.  Yet another one of the state of Florida's fantastic state parks.  You don't need the beach when you've got the pristine white sands of the shores of Blackwater river.  The river and the surrounds are super quiet, peaceful and beautiful.  Tubing, kayaking canoeing are all super here as is the bike riding, if you know where to go, (hint: follow the road to the boat ramp just north of the entrance).