One of things I love about DC are all the esoteric sites to see (like: Accidental Museum of Paleontology), but every once in a while it's nice to just head down to the Mall and see the popular monuments.
I did just that yesterday with Shira and Elana. Neither of them had been to the World War II Memorial, so that become our goal. It was the perfect weather for Mall walking, and we encountered the usual blend of tourists and local sports clubs (kickball, anyone?).
Just an awesome time and both ladies found the Memorial to be impressive. It's my third or fourth trip there, and I still find it be inspiring.