Mermaid - Are you allowed to ride horses on the trails in Grayton Beach State Park?
That would be a no. However, the State has cut in a road and parking on Hw 283 in SoWal for future staging area for horses. There are no trails cut yet, and this project was started about 2 years ago. They put up a sign and cut in the parking and road, but then it quickly stopped. This is the State Forrestry people who have this project, not the County.
The horse farms are quickly fading from site. I know of a few horse people in NoWal who ride, but those co-ops like you are searching for, are rare. There are a few developments of which I know in NoWal and Holmes County, which are in the pre-development stage. They are horse friendly, with lots small as two acres and up to 10 acres, but they do not have a common barn and stables.
I do have some acerage in the Freeport area which would be great for such a co-op, but currently, it is wooded property.
I also have some 4 acre lots available in Freeport where you could probably have a couple of horses.