I'm headed up to the Washington, D.C. area with my wife and her parents this Thursday for the Memorial Day weekend. We're staying with my parents who live near the end of the MARC Brunswick line (in the panhandle of WV). I've visited the DC area a lot (and lived/worked up there for a short while), but my wife has only visited once, and my in-laws have never been to the DC area. What must see sites should we include in our list that aren't listed below?
So far, we have tours of the US Capitol Bldg, and Bureau of Engraving and Printing scheduled, with plans to see (from the outside) the White House, the various memorials on and around the mall, Arlington Cemetry (not on memorial day
and perhaps a Smithsonian. For the days outside of DC, we're going to try to visit Harper's Ferry, WV, Gettysburg, PA, some closer battlefields (father in-law is into that sort of thing). Maybe spend some time on the Shenandoah River or something like that.
Can anyone think of other things that someone who has not been to DC might enjoy seeing/doing while there?