As John Denver sang Rocky Mountain High, you can be sure those sentiments included Vail Mountain with its 193 trails over 2140 skiable hectares. You don't get much better than Vail on a sunny blue-sky powder day.
Too little snow to ski? Then visit the Colorado Ski & Snowboard Museum in Vail, with its rather amusing collection of ski fashion and a history of skiing, plus the tales of a World War II alpine unit which trained in the Rockies. It's free to visit.
Aspen's Maroon Bells road climb is a tough one-way ride all the way up 17.6km to the foot of an incredibly beautiful wilderness area in the Rocky Mountains.
Not one for weekend warriors; you'll need to have done a bit of hill training before you tackle this two-wheel challenge.
If you're a member of the fairer sex and want to learn the basics of climbing or, as the website says, "how to kick axe", check out Chicks with Picks. They offer tuition in rock climbing, bouldering and ice-climbing - think crampons and ice tools - so their wanna-be climbers can breathe in that fresh air and enjoy the wondrous views from some of the Rockies' peaks.
Enjoy tramping or mountain biking between Colorado's mountain huts with San Juan Huts. The firm helps health-conscious independent travellers wanting to go hiking, mountain biking or backcountry skiing into remote areas of southwest Colorado and Moab.
You can move between huts or use one as a base for day trips. Walk in summer, backcountry ski in winter. The huts have bunks and stoves. There's varying terrain for all levels and it is recommended skiers use a guided service.