My son and I are staying at Andrews Air Force Base at the end of March. We will be traveling into D.C. two consecutive week days to do some site seeing. I have been on the metro site and am having trouble deciphering which parking starts when and for how much. I planned on driving from the base to Branch Ave. I am not set on how early we will start, depends on my kiddo but not too late. A problem I have been coming up with is that the site lists the all day sites like this: All day spaces: 3,072 (Fees collected upon exit, 10:30 am to Metrorail system closing). Does this mean the parking for these spots become available at 10:30? Does anyone have any advice on when I should get there? What's the best time to get there? Will I have trouble finding a parking spot? Should I go to a different location? Thanks.