Hike or ride smooth singletrack on this 7.2-mile lasso-loop, which climbs gently through rich scrubland and ponderosa forest to a killer mountainside overlook.

Cruise 5.2 miles along gentle foothills, Ireland-esque pastures, and past an old sawmill to a vista overlooking Boulder Canyon and the Front Range.

Quiet rules on this mostly off-trail, 5.1-mile scramble up a boulder strewn canyon to a gnarly rocky crown with panoramic mountain views in Pike National Forest.

The very best section of the 483-mile Colorado Trail lies along this 40-mile San Juans stunner. Start at 12,500 feet and drop past hidden waterfalls into the Animas River Valley, where the Grenadier Peaks tower overhead.

Hike lonely trails filled with Yosemite-like granite formations in Lost Creek Wilderness on this 15.4-mile out-and-back up the Retirement Range's highest peak.

Gaining 2,300 feet in just 2.6-miles, this out-and-back climbs the slopes of Engineer Mountain and rewards with high-altitude wildflowers and views of a rare rock glacier.

Ascend North America's tallest dunes for a day surrounded by alpine peaks, a desert valley, and shifting mountains of sand on this 6.6-mile loop in America's newest national park.

This 7.6-mile hike in the San Juan Mountains travels past golden meadows and three waterfalls en route to a stunning tarn in Ice Lake Basin.

Thanks to only a little elevation gain, this 7-mile loop offers flatlanders great rewards (big views, wildlife, solitude) without much suffering. Pack plenty of water and sunscreen.

Follow this 9.9-mile loop through vibrant wildflower displays and past snow-fed streams to a huge alpine lake with unbeatable campsite views of Mount Meeker.