The Huemel Circuit is a lesser known trek in the El Chalten region of Argentina's Patagonia for a variety of reasons. It's more remote, technical, and challenging than others in the area. It's also one of the most wild and beautiful places I've been.
Hike Hagerman Tunnel for an easy half-day hike that takes you through some of Colorado's mining history.
My trip report of the El Diente Mt. Wilson Traverse. One of the four Grand Traverses on Colorado's 14ers.
Go on an adventure in Ouray and climb the Via Ferrata for an extreme day traversing cliffs. You can do it with out without a guide.