Tour Operator: Keystone offers some of the finest skiing and riding experiences in Colorado. Steeps, bumps, groomers, terrain park, trees, rollers, teaching terrain - you name it we have it. For years Keystone has been renowned for its incredible tree skiing, this year it got even better. Thanks to the Keystone Ski Patrol and the sawyer group, we've cleared some 500 acres of deadfall trees. We improved the health of the forest, created habitat for small animals and made the tree skiing experience immeasurably better.