I never miss the archives and the National Cathedral. The archives don't take too long to visit. You can combine them with a Smithsonian museum (on the mall). You can take a guided tour of the National Cathedral or attend a service if that works. I have done both. I have also visited Ford's Theater and attended a play there. That was a great experience also! I also found the Phillips Collection to be a must see (and the National Gallery). Have fun and do ride the metro.
Since the summer heat is brutal, you will want to drink lots of water! Have fun!

Since the summer heat is brutal, you will want to drink lots of water! Have fun!
