Vail summer resort is home to all levels of Mountain biking and Road biking trails. For an easy to moderate road ride, the paved Vail Recreation Path runs along the banks of Gore Creek in Vail and stretches through the Vail Valley. Winding down from East Vail the path crosses through Vail Village and then continues west down the valley through Dowd Junction, then onto Avon and Edwards. Eagle County offers 58 miles of paved recreational paths! 
For more of a challenge try the Vail Pass path. The trail is 8.7 miles, stretching from East Vail to the top of Vail Pass with the elevation gain of 1,831 feet.  If you are not feeling up to the climb, shuttle a car to the top of the pass and enjoy the exhilarating ride down!  Vail Pass Path Map and Information
For the more advanced cyclists, popular area routes include US 24 to Leadville and US 6 near Wolcott, just minutes from Vail.