I too would say Gettysburg and it will not disappoint. An option to consider is setting up a personal tour.
The Guide will drive your vehicle while you and the family sit back and take in history on a personal level.
Also, a personal tour typically delivers some things a bus tour can not. For example, the last one We took
the guide went down a small side street, parked and had us get out of the car to look at the side of a house
that had more bullets in it than you could count. That alone made the personal tour outstanding.
A good friend of mine is one of the best guides available and has been doing tours for many years. If you decide
to do Gettysburg, and want to consider a personal tour, pm me and I will provide you his contact information.