I'm also chasing some venues where we could have it between here and York PA, north or south by another 25-50 miles or so. I think that puts it centrally located for most folks.
Requirements:
Drinking allowed
RV or motel sleeping arrangements available
Fishing available
Campfires permitted
Shooting range
There are a few good private campgrounds with cabins near state or local parks that can cover most of that. Just need to find the right ones.