Make a stop at Monticello on the way up from Williamsburg, it is amazing and well worth the stop. Luray Caverns, Skyline Drive as well
Each year we bring my parents to Lancaster. Sight and Sound theater is definitely worth seeing. We stay at Beacon Hill cg. It's not huge, and there are no amenities except for full hook up. We bring our camper and rent the park model for mom and dad. Makes for a fantastic weekend!
Someone mentioned Steamtown, which is worth it too. In Lancaster, there is also Strassburg for the rail museum.
Gettysburg is a destination for us every few years. If you enjoy historical places, it can't be beat.
The list goes on and on. I imagine you can spend an entire summer exploring the east coast and not get bored!
