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.
Colorado Ski & Snowboard Museum
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.