Smithsonian museums: American history, air and space, and museum of natural history all were good! The Holocaust museum was one of the highlights for us. (okay, that doesn't sound right at all but, in all seriousness, it is a very well done museum, I initially wasn't 100% on going (obviously it's not a fun thing) but it ended up being one of the best (if not the best) museum I've gone to, very moving exhibits) There is one place I wanted to go but I missed the last tour when we got there- the international spy museum, it looked probably pretty hokey but a good time, I hate I missed it. We stayed in the Hay Adams hotel which is right across the street from the white house, if you feel like a stop at a bar, check out the bar in the basement of the Hay Adams, it's called "off the record" it's a pretty cool little bar that seems to be authentic DC rather than silly touristy. We saved a bunch of coasters from there, they have these great satirical political cartoon coasters. Also, they have what I honestly believe to be the best olives I have ever eaten in my life as one of their bar snacks, LOL!