After that, we made the short (but cold) trek to the Smithsonian museums of American History and Natural History. It was the grand re-opening of the American History museum so there was special entertainment. The boys were especially excited to see the setup from R2D2 builders club - a bunch of grown men who, just for fun, build full scale working models of droids. Other highlights were the hands-on invention exhibit, the mammal exhibit, the dinosaurs, and the bug zoo.
The next day, we let the boys play all morning, and then went for a drive through the countryside and an afternoon hike at the Red Rock Wilderness Overlook Park that has great hiking trails overlooking the Potomac. We brought along a few letterboxing clues and after much searching Ed finally found one.
On our last day, we headed to the Air & Space Museum next to the Dulles Airport. The place is huge with a Space Shuttle and more planes than you can count.