My favorite
Hook Lake AEP is I think the second largest of the campground areas, outside McConnellsville, Oh.
Hook Lake campsites are spread throughout the woodland loop above the lake recreation area. This would be an ideal area for large groups or a family reunion. Realize this is bare basic camping with pit toilets and no electricity. Print out a permit and stake your claim for a free , quiet, entertaining stay in the AEP wilderness.
Its a toss up for me between this site and Sand Hollow as my favorite. The areas are large enough for several, and spaced out along the loop to give some privacy/sound buffer if it is a large group staying there. They are right on the water too for convienience of fishing or boating.
Plus there are plenty other things to do in close proximity. The Ohio farm country is awesome and McConnellsville, Oh offers some cool old buildings if you like architecture.