Rafting in Utah on the Colorado River through Westwater Canyon, a precipitous gorge of granite and schist, packs in all the best elements of an adventurous desert river trip: beachy campsite, ancient geological formations, and gnashing Class III and IV rapids that will get your heart clanging-includes Sock-It-To-Me, Room of Doom, and the infamous Skull rapids.

Every OARS trip combines amazing rivers, friendly guides, incredible scenery, quality gear, comfortable camping, and unexpectedly delicious food, but the OARS experience is the unique and captivating sum of all those parts.  It's much more than a river trip, it truly is an experience. 

http://www.oars.com/utah/coloradorivercataractcanyon.html