We were at Salt Fork in late August. Salt Fork is the largest State Park in Ohio. The horse camp has both wooded and very open sites. The wooded sites can be tight for a larger rig. There is water for horses and people and pit toilets. There is also a concreted wash rack. There are showers and a dump station at the regular campground that you can use. It is a couple of mile drive from the horse camp. The trails are nice, but can get muddy quick in rainy weather. There are several loops, but they are at least 12 miles long, so if you want a shorter ride it's out and back. There are quite a few areas where you can ride down to the lake to water your horses. I would caution that you not ride in if you don't already see evidence of horses having been there. The bottom is questionable in a lot of areas and you can sink in fast. We are having a problem with Emeral Ash Borers, so many counties are under a quarantine for firewood. We were able to take it in in August, but by the time you plan to make your trip that could change. You'll want to check first. There are also several other State Parks within a fairly short drive; Barkcamp and Beaver Creek come to mind.

Let me know if you have any specific questions. I'd be happy to help out.