The one huge caveat.... all of the park-n-rides are over subscribed during weekdays. A couple of years ago in February, every parking lot I checked as I drove in from Maryland was full. I actually found a parking spot down by the tidal basin and then walked around the district. I used a taxi to drive me back to the Tidal Basin that night that I hailed at Union Station.

Metro is a great way to get around -- but don't be to discouraged about driving around the district. I've done it several times. Yes, it is a bit slow, but still fun.

Mark