Keystone is where I learned to ski, and it's still my favorite place to take a run. Thanks to the fabulous instructors, I went from strapping on skis for the first time, to skiing Blue-Blacks in a week. Keystone has runs for all skill levels, and the people on the slopes are pretty considerate of their fellow skiers. Like any trip out west, you'll pay a premium for the lift passes, but it's well worth it.
See you on Go Devil!