We're planning a week in Williamsburg at the end of June. If I can convince my husband, I'd like to take one of our days and go to DC. I haven't been there in over 20 years so I really don't remember much. How much can be done in a day? It would probably just be my husband, 10 year old son and myself. Probably going to leave the 1 and 3 year old at the hotel with the grandparents. I'd really like to go to the Museums of American and Natural history, and pretty sure my husband would like the Air and Space. However, I really want to go to the zoo as well. Also, we will be driving. How bad is traffic? Is there somewhere we can park the car while we walk to the museums? I see that the zoo is further away.