If you guys make it to the APA conference in DC this spring, you should check out the new Smithsonian Air and Space Museum. We went a couple of weeks ago when it first opened up, so it was incredibly busy. It costs $12 to park, but is free to get in, but it is well worth it. It was crowded, but not where it is uncomfortable because the "gallery" (aka - the hanger) is so large that everyone can see all of the exhibits.
You can take some great photos of some very historic aircraft. I just can't wait for them to put more helicopters in the place.