Also, Jonestown KOA is another campground not too far from Twin Grove, one exit south on 81.
I've visited there, nice grounds with all amenities, plus the creek runs thru it if you want to do a bit of fishing.
Fwiw, I'd look to stay close to TwinGrove Park, that's our dinner and night activities home base.
Aoaa is a solid 30+ minute ride from that, and the majority of our group. The dinner and "evening activities " are held at Twin Grove for good reason. There are plenty of places near or in there that can be of great help if any problems arise.
Rich