We just did the ride up Red Mountain to Durango - spectacular! Be careful of crosswinds on the descents though - it was quite hairy when we were there.
The ride up out of Ridgeway to Telluride (Dallas Divide and Lizardhead Pass) is also gorgeous. And, the ride up Grand Mesa out of Grand Junction is also amazing - but it can be brutally hot. We lucked out with fog, sleet and rain a few weeks ago.

Try the KOA campground outside of Ouray - halfway between Ouray and Ridgeway. Cute little cabin, clean showers, and a nice stream running through the campground.