I know there is some stuff on the east side of the Big Horns, but don't know if there is anything in the beginner/inter. range. Drive over and hit Cody you've got the canyon and the town run. Get Whitewater of the Southern Rockies guide book I'm sure Core Mt. Sports in Cody will have a copy, or you could order from CKS. Whitewater of the Southern Rockies
you've got stuff closer than Denver, once you get down to the Front Range you'll have lots of options. But your looking at 5 hours driving to get to Ft. Collins.