Family Road trip from San Antonio to Washington DC 2 adult drivers 3 teenagers, need advise best route plan in driving straight to DC have a total of 8 days to take, suggestions on where to stay,eat we are there to visit most of the national monuments. Would like to see Gettysburg on the way back home or should we get there 1st? Maybe the Hersey factory ?? View of the black hills, recommend sights to drive through on way back?