We went to Washington dc/Maryland last year. Helps thats where I was born and my parents still live there. 8 hour drive with multiple potty breaks for the little ones. We stayed for a week and did six flags, Baltimore aquarium and harbor, got tickets to go to the top of the Washington monument an tour the white house (planned well in advance), walked the plaza and visited a couple of the smithsonian museums and just 2 more hours east we went to rehobooth beach and spent a day at the ocean. pretty fun filled vacation with lots of fun/educational/cool things for the kiddies to remember. They still talk about it to this day and are already asking if we're going back this summer.