Spend some time in Alexandria!
While you are visiting, make sure to spend some time here in Alexandria -- George Washington's home town.
You can check out the historic sites, activities, restaurants and much more at
http://visitalexandriava.com/. Every day, from 10:00 AM to 10:00 PM, a free trolley will take you from the King Street Metro to the Waterfront and back. You may get off along the way to explore the city, eat or window shop.
Many neighborhoods in Old Town (where you will be staying) are historic, with homes dating as far back as 250 years.
(Not a city employee, just a resident who loves living here.

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Let me know if you have any questions.
(In regard to the parking, the access and egress are user friendly, but the garage itself is not. The spaces are very narrow and there is not much wiggle room to get in and out of them. Also, the garage is shared with the Hilton Hotel and you must make sure that you are parking in the right area.)