There are tons of trails here but only a few are serviced by the summer lift. If you are in great shape (or too cheap to buy a ticket), skip the lift and ride up the mountain (all 2000 vertical feet). The "Blue" trails are the singletrack options and they can be pretty challenging for most riders. The singletrack was mostly washed out and very rooty and steep in sections. If you choose the "Green" trails, be prepared to take the road all the way to the bottom. Overall, not one of the best lift serviced downhills available. Go to Keystone instead (although the scenery is tough to beat).
From Denver, take I-70 West to exit 167, Avon. Follow the signs to the Beaver Creek Ski resort. There is no parking once you're up the mountain so be sure to make arrangements.
http://www.singletracks.com/item.php?c=1&i=711