From Reston: Take Lawyers Road going east into the town of Vienna. Turn left onto Church Street and follow it until it ends at East Street. Turn left and go one block on East Street to Ayr Hill Avenue. Turn left and park on Ayr Hill Avenue.
From I495: Exit onto Route 123 south. You should pass the Tysons Corner Shopping Center on your left and shortly pass over Route 7. After passing the Westwood Country Club on your right turn right onto East Street and go 2 blocks to Ayr Hill Avenue. Turn left and park on Ayr Hill Avenue.
Click here for a link to the starting location in Google Maps.