I love WalkingTown DC (ok, fine, and BikingTown DC). Every spring and fall, Cultural Tourism DC pulls together various Museums, tour guides, historical societies, community groups, and othjer entities less definable and offers over 100 free bike and walking tours. Frankly, if you're in town and not taking in at least one of these, you're really just wasting your time in Washington.
But what to do? With so many to choose from, which to pick. Well, everyone is different, but here's the five I would (and hopefully will) do if I had some free time Saturday and Sunday:
note: be sure to check Cultural Tourism DC's website for full info. Some tours require reservations.