This gate along the drive is pretty ineffective but I'm sure that wasn't always the case. This road used to connect to the the Picayune Strand State Forest but has since been closed to vehicle traffic for preservation of the wildlife. Hiking and biking are permitted and there's a sufficiently large parking area at the gate. Below is an example of the road surface at the end which is like much of the areas.
I drive down this road frequently throughout the year in varying conditions and have seen references and complaints from people that the road condition is very poor with mud, potholes, and the like spoiling the drive. To that I can only say that anyone driving an unimproved dirt road should understand what that means. If the concept is difficult I strongly encourage those drivers to stick with the pavement. There's beauty along this road that would be destroyed by "improving" it.
I'll add that I find the golf cart crossing sign pretty funny. Yes, Florida is a big golfing state but someone would have to have an awful powerful swing and nasty slice to have to travel here to retrieve their ball.