I would area on staying north unless you have millions to spend south of Fort pierce or Vero. The west coat is even worse with retirees that have unlimited money to spend. On the east coast mainland Sebastian is nice. As long as you stay away from the coast and big $$$$ retirement areas you can find nice areas.
Alafia state park and surrounding areas have some great MTBing trails, same with santos along the greenway. So many good trails up there. Just rarely see hikers. Ocala has some bears to keep you on your feet. Even heard the panthers are moving north. Lots of springs around also.
Just remember MTB'ers rule most off the trails.
Whoops I'm a MTB'er looking to hike? Sorry guys. Just a fair warning.