My g/f & her dad have property near Everhigh, on 80 between Clewiston & LaBelle. Most of the land there is private, but a good portion is accessible. Every time we go up there it seems like more & more is fenced off. Some good trails & riding left though. Google Earth screenshot shows where we usually ride - lots of trails through the woods too. To give you a frame of reference, the smallest rectangle along the bottom edge (uncleared) is 5 acres.
Yep my uncle owns 20 acres extremely close to where you just said lol it is off of everhigh and center. Lots of trails out there but all private property.