I just returned from a trip to Denver, while visiting my son and daughter-in-law, who always try to provide something for "Pops" to do when he visits. This time, they took me snowmobililng to us easterners, sledding to those in the know, and we had a blast! It was beautiful in Denver, but freezing up on the mountain. I can't remember the name of the group we went with, but will be glad to provide it. It was a definite must, and not at all tiring on an old and aging body. Just cold!!!!