Arlington staff place small American flags in front of each gravestone for this weekend (and only this weekend according to the guide). It was amazing to see all the flags fluttering along the rows and rows of historic markers. We visted the grave of JFK and saw the changing of the guard at the Tomb of the Unknowns. We'll have to make a trip back someday, because we arrived too late to tour Arlington House, which has been restored as a monument to its former resident, Robert E. Lee. (Update: We went back on 6/1/08 and toured the house which was under restoration. I took this view of Washington from the front yard.)
Geographically, Arlington is across the Potomac from the Mall, so the views are amazing. The cemetery and the Lincoln Memorial are connected by a bridge, which is what we stood on to watch fireworks last July 4th. We picked up the Mount Vernon Trail at the bridge and rode south the approximately 11 miles home. The entire trail is around 20 miles long and winds all along the Potomac - past the Mall and Monuments, past various marinas, next to the airport, through Old Town, and ends in Alexandria at George Washington's Mount Vernon estate. (Update: Here's a picture of the bridge with the Lincoln Memorial at the end that I took on 6/1/08 on our second trip.)
http://www.nps.gov/archive/gwmp/mvtmap.html
