Well, we ended up in the Aspen area. We did the 4 pass loop in the Maroon, Bellview, Pyramid, Snowmass area.
It was franfriggintastic.
The meadow slopes were impossibly filled with wildflowers: lupine, columbine, delphinium, asters, paintbrush, daisy, roses.
Water sources were numerous.
Wildlife abundant : we saw beavers (ya!), elk, deer, marmots, pikas, even a moose
90% of the path is packed clay, except where it is not. The other areas are rock slides, (scree), that you can easily maneuver over. Think football sized rocks, firmly embedded in the soil that you just step over.
The views are stunning, especially as you descend from the Snowmass pass down to Snowmass lake.
Downside: you never feel like you are out on your own, there are simply too many people doing the loop. But I figure, if you ever got hurt, you could count on a kind soul to meander by within a half hour.
We also visited the town of Salida. Salida has won a spot in my heart. It is filled with art galleries and bike shops. Everyone rides a bike and they don't lock them. They just park them out front of the store they are in and leave them there. The food there was excellent. Lots of interesting things going on there. The people are smart and kind. Anyway, We went on the classic epic 40 mile Mountain bike ride starting at Monarch Pass. That was to die for. Serious serious serious fun. If you do nothing else when you are in Colorado, do this ride. You will not regret it.