Sounds great bp. Don't forget the night tour of the lighted monuments.
Map of the Smithsonian complex:
http://www.si.edu/Content/Pdf/Visit/mallmap.pdf
Says it is about a mile from GW Monument to the Capitol and I read that it is about 2 miles from the Capitol to Lincoln's Monument. Google maps states 4.2 miles from Smithsonian to Arlington.
Map of Arlington Cemetery:
www.arlingtoncemetery.mil/docs/ANC_Map.pdf
http://www.nps.gov/nama/parknews/shuttl ... metery.htm
The National Mall is the monumental green space at the heart of Washington, D.C., the heart of the national psyche, and the heart of civic America. This national treasure stretches for two miles just south of the White House, from the U.S. Capitol Building in the east to the Lincoln Memorial and Potomac River on the west. The park is home to the Smithsonian, a huge collection of the nation's best (and free) museums, as well as most of the country's most famous memorials and monuments. It is the number-one destination for visitors in the city, and one of the biggest destinations in the country.