Our family is going to Washington DC for a day on vacation. We are staying at Days Inn in Alexandria, Va (I-95) the night before. I am not familar with the metro rail or bus or where it is located. Do we just park our car at the metro station? Is there a parking fee? We want to to the DC by foot tour so I have no idea where we would get off on the metro for this. I am from a small town and I have not traveled to a big city like this before. I am planning this "road trip" vacation for my family by myself. We our traveling to 5 states and I want to do all this without the help of my husband:) Thanks for your help!