Going to D.C. next week

[Bluffoon]

I am taking my son (he's nine) to Washington D.C. for a few days. Anybody have any good sightseeing ideas?

We are going to see all the monuments and the Vietnam Vets memorial and do some of the Smithsonian museums etc.

One thing that was suggested was to take him to Arlington National Cemetary. I was wondering what is the best way to get there from the mall? Can you take the metro?

Thanks for any tips and ideas.

Jim