Lost Lake Slough and the Three Lakes Trail loop
Not far from Kebler Pass, at the base of the Beckwith Mountains, is Lost Lake Slough. In addition to being a great car-camping area, it's the trailhead for the Three Lakes trail loop. The loop is relatively easy and takes you past a great waterfall in addition to the lakes.
To reach Lost Lake Slough, take the Kebler Pass road west out of Crested Butte or east from the Paonia Reservoir.