I loved that part, but we were going the other way. The only thing I disliked was the lousy bike trail on the part near Alma. We would have used the road there but construction forced to use the bike path. That was 2007 so I assume the construction is completed. Also the bike path would be better going west. The problem with the path was heaved up slabs of concrete that were a problem going down hill. They wouldn't be as bad at the slower pace of climbing.
That bike path (ghetto) was pretty bad even "climbing" in 2009. There were rollers near Fairplay; after I hit one of the joints and nearly dislocated my pinkie, we climbed up the hill to the road and had no problems after that.
The south park scenery from Current Creek Pass to Hoosier Pass was the best in Colorado, IMHO.