Check out the many rides under "road rides".
http://www.teamevergreen.org/
There are many miles of paved bike path, but who wants to ride on those? Not me. The mountains are very challenging and a lot more fun. The only way to get into the mountain easily is to live near them. I ride about 11 miles from my home in Highlands Ranch to Wadworth & Deer Creek Canyon Road. From there, it's only a few more miles before the real climbing starts. Most people drive to the intersection to start their ride, but I'm try to avoid a 20 mile round trip and loading/unloading my bike twice, just to get in ride. From that start point, you can ride all the way to the top of Mt. Evans or over to Idaho Springs.
http://www.bicyclerace.com/history.php
If you live toward the east side of the metro, you'll be driving a long way to get in a scenic ride.
There are some weekly race training rides, but riding laps around an office park isn't my thing.
http://www.americancycling.org/resul...mtevans/sm.htm