You may want to consider the Upper Colorado above Dotsero. It'll be running about 3K this weekend and will have good Class II rapids with pools below them.
From Cottonwood Island to Dotsero has about 5 or 6 Class II rapids generally followed by quiet water. The launch and takeout are very easily accessed and its a good reach to hitch the shuttle. Most of the reach can be scouted from the road and anything that can't be scouted before launching isn't any more challanging than what you'll see. To get there take the Dotsero exit, you'll see the take out on the east side of the river. Go north up to Colorado River, pass Lyons Campground (launch there for a shorter run, campsites available) and continue to the Cottonwood Island launch site.
A 1991 BLM Upper Colorado Recreation Area guide has a "fishing access" and then the Burnt Tree Ridge Site a mile and a half and three miles below the Dotsero takeout, respectively. I've never boated below the Dotsero takeout though some of it may be scoutable from I-70
The guidebook has 11 topo coverages from the confluence of the Blue to 5 miles below the Eagle.
Nothing in the world is more yielding and gentle than water. Yet it has no equal for conquering the resistant and tough. The flexible can overcome the unbending; the soft can overcome the hard. - Lao Tse