Originally Posted by
brendog
Why not stay near DCA, and then have an easy trip out in the morning? There are tons of hotels near DCA that have shuttles or are located on the Metro (There is a stop at DCA).
^
This is a way safer bet than trying to deal with a transfer in the morning.
Staying near DCA should also give you metro access to do something fun for dinner (if you're up for it) in the district!