For pavement lovers in Aspen, it doesn’t get any better than the Rio Grande Trail, which spans a continuous 42 miles from Herron Park in Aspen northwest to Two Rivers Park in Glenwoods Springs. There are mountain views, fields of wildflowers, riverfront sections, farms and parks along the trail, which parallels Route 82, passing through Old Snowmass, Basalt, and Carbondale.
Attached is a trail map with great descriptions of 9 individual sections. Closest to Aspen is the 8.4 mile section from Herron Park to Woody Creek, with numerous access points. There are two short steep climbs and great views of Aspen Mountain and the Roaring Fork River. Note that the two miles of trail between McLain Flats Road and Stein Park are gravel. A great 5-mile out and back is Herron Park to Stein Park.