I explored at Triple N Ranch Wildlife Management Area located in Osceola County by the small town of Holopaw. It is a large area with around 16,000 acres of property that has many trails to hike and places to roam.
The area has a lot of history as well, the area was part of the last large open range in the United States. At the beginning of the twentieth century Florida south of Orlando was the only place east of the Mississippi where the population density was less than two persons per square mile.
Open range ranching continued in Florida until 1949, when the Florida Legislature passed a law requiring all cattle to be fenced. The central Florida palmetto prairie was home to the Florida cow, a small, bony, long-horned descendant of Spanish cattle that was able to survive heat, bugs, and poor forage.
If you do explore this area I would suggest it in the dry cooler months of winter as it can get very wet and hot there during the summer. Though there are many shaded hammocks and scenic trails, a lot of the area is also open pine scrub habitat.