Might have to take you up on that offer. I have a conference in DC in September. Right now the schedule is really tight though, but you never know what will happen.
I actually had one of the best tours of DC a few years ago with some friends of w's family I had just met. I kid you not, we are driving around dc with a cop and firefighter, beer in car, and stopping at accident scenes and other police vehicles to talke with them. Apparently, when your on that side of the law you are the law. I thought for sure we would be arrested at some point through the night.
I was there for the FIL's retirement, and actually got a tour of the pentagon post 911, which doesn't happen very often.