Mountain biking is back at Tamarack, with 2,900 vertical feet for you to explore. The trails are open now, and use of the trails if FREE if you have your own equipment and don't need a lift up the mountain. Shuttle service to mid-mountain begins July 4, and runs Saturdays and Sundays through Sept. 7. Get tickets and rent bikes at the Sports Dome in the base area. Other activities include white water rafting, zip line, hiking and disc golf.