Ballston, VA to Mt. Vernon, VA on the Mt. Vernon trail
Head East on the Custis trail from Marymount University. At the Key Bridge in Rosslyn join the Mt. Vernon Trail. Head South until you reach Mt. Vernon 20 miles later. It was a nice day. As expected there were lots of hikers, runners and bikers on the trail. An unexpected encounter was with a crayfish that was crossing the road. He was happily strolling on the road. I stopped to take a picture. He sensed danger and took a defensive stand with his claws open.