I'll second what Rickster said. Plan on coming out next July for some great riding and fellowship.
As far as rides are concerned here are just a few of my favorites:
Independence pass Highway 82 from Twin Lakes to Aspen.
While in the area, Drive south of Aspen to the Maroon Bells (see signature line photo) THE most photographed mountian range in the world.
Highway 550 and the San Juan loop, Highway 145. These have some of the most some jaw dropping views, so much so that it's hard to keep the bike on the road.
Some personal private stashes: Dear Creek canyon road off of Kipling from C470 in South West Denver, It'll take you to Plesant Park road and let you out at Conifer on 285.
Bear creek out of Evergreen to Morrison.
Estes Park is great if you don't mind getting ran into by people looking at the mountains instead of their driving
I always take the back road up off of 34. Turn at Drake, It's a less traveled road with some extreme twisties.
And what I call the 5 pass ride, a great day ride from our home here in Bailey: Take 285 to Fairplay, North on 9 to Breckenridge, stop for lunch or a good stretch, highway 6 past Keystone and A-Basin over Loveland pass, Jump on the super slab to Idaho Springs and the Mount Evans exit(highway 103). Once you reach the top you can take the road (Highway 5, highest paved road in America) to the top of the mountain(14,264 ft. ASL) or just follow it (103) on around and down to Evergreen. It too has some extreme twisties.
The nice thing about the roads here is that you can drive them one direction for an awesome view and then turn around and ride it the other way for a completly different view.
Hope this ramble didn't confuse you too much. If it did, take a map of Colorado from I-25 West, pin it up on a wall and throw a dart at it. Whever the dart lands, go ride there, you can't go wrong.