From now until April 20, the St. Regis Aspen Resort is offering guests a travel package that entails a four-night stay at the resort highlighted by a day of heli-skiing fresh powder in the Colorado Rockies. Since the 1960s, heli-skiing has offered adventure seekers easy access to nature’s most remote summits and pristine slopes. For this adventure, which is led by the pros at Telluride Helitrax—one of Colorado’s leading companies for helicopter skiing and snowboarding—participants will begin the day with a 40-…