ALPINE TUNNEL LOOP
One of the lesser known loops in the Valley... if big views, alpine expanse, and a little bit of hike-a-bike are your thing, then put this on your list. It starts in the town of St. Elmo and rides road and old railroad grade for the first 8.5 miles. Gradual grade makes you forget the elevation until it's time for a short hike. You'll top out at 12,300 ft.
Start Early, the afternoon thunderstorm is clockwork
Mt. Princeton Hot Springs is at the bottom of the Canyon for a post ride soak
Peep over the edge to see the old rail station at the junction of Tunnel Lake and Trail 539