If you have a Canoe? If not you can rent one. (believe me it will be worth it)
I would suggest Promised Land State Park.
http://www.dcnr.state.pa.us/stateparks/ ... dland.aspx
It is a State Park and is Patrolled and Patrolled often, so it is safe.
Its a beautiful old CCC campground.
There is a Village in the center of the Park with 2 nice restaurants, a general store, bait shop...And a Bar for Dad. Just in case things get to overwhelming.
Its within your driving range. 4.5 hrs
It has 3 campgrounds on the same Lake. 2 accessible by water.
My son, a buddy and I would go to one campground area and set up a base camp, usually The Pines. Spend a day or so around that campground, enjoy the swimming area all the commercial stuff.
Then load enough gear for an overnight (or 2) in the Canoe and paddle around the lake...fish, fall over board, stop on islands and explore and eventually get to the other Campground, Pickerel Point (Very primitive, water front sites). Set up camp from the Canoe. Spend a day or so. Swimming, fishing, throwing rocks at things, catching things that make girls scream etc.
Then break Camp early and paddle over to Conservation Island. Spend some time there, and then back to the base camp.
its real nice and your basically going on a Camping trip while your on a Camping trip.
It really makes it interesting when Dad pretends to get lost and tells everyone that we'll have to spend the night out here.
And then the stories Dad can tell to scare the crap out of them are endless.
I guarantee a behavior improvement from this that will last for at least 6 months.
Happy Trails
Len