We are visiting relatives in Winchester VA for Easter and my 25-year old son would like make a super quick trip to DC while we are there. He doesn't mind a long day of driving and is OK with just seeing the major sights from the outside this time. The only day we have free is Easter Monday. Would you suggest parking and taking the Metro in or driving in to a parking garage such as the one at Union Station? What do you expect traffic to be like on that day? When he first mentioned the idea of driving into DC for the day, I thought it was a little crazy but maybe it could be an adventure!