I will be renting a car in Arlington and would like to know how "difficult" it is (i.e., how long is the walk, is it outdoors, etc.?) to go directly from the Metro Station at DCA to Parking Garage A where the rental car agencies are located.

Alternatively, I could rent from Enterprise on J.D. Highway but, for the time period I'm looking at, their rates are quite a bit higher than those on airport.

Thanks in advance.