In the driving directions, where it says "After 2.7 miles..." it should say after 3.7 miles. If you turn left after 2.7 (actually, 2.6) miles, you end up way south of Shenandoah -- which actually allows you to do a pretty cool, although much longer, hike.
"So I was sitting in my cubicle today, and I realized, ever since I started working, every single day of my life has been worse than the day before it. So that means that every single day that you see me, that's on the worst day of my life."
--Peter Gibbons (Office Space)