Big Bend National Park, Sam Nail Ranch to Emory Peak and back.

Tyler Priest described the route:

Oak Spring Road to Oak Spring Trail to The Window Trail to Pinnacles Trail to Emory Peak Trail to Emory Peak, and back down the same route.

The National Three Peaks Challenge involves climbing the three highest peaks of Scotland, England and Wales.  Usually, people drive between the trailheads.  Cycling or running between the trailheads are other options.  Which ever way you choose, the time starts at the first trailhead and