Wow, that is a great list isn't it? In addition to the Smithsonian collections, the public monuments and the like, you could opt for a tour of the mint (maybe they will hand out some samples ), and the Holocost Museum. They are pretty close by. Take the M to Georgetown for great places to eat. Not sure if you are as mad for cupcakes as many, but the stars of the TV show Georgetown Cupcakes can be visited (if you don't mind waiting in line for an hour). Keith I would suggest if you have any time, rent a car and go to Skyline Drive (only about 3o or 40 minutes south of DC). It is a world away and you can see deer, bears and other critters along with beautiful vistas of the National Park! Well worth the time and effort. Let me know if you decide to do that I can put you in touch of printed guides to the park.