There are both guided and do-it-yourself trips offered on Cache Creek. You can rent boats from a few different companies or have a guided trip where they will provide your camping gear, food, shuttle, etc.
Whitewater Adventures: (800) 97-RIVER. Their main office is located in Sacramento. Call in advance to book trip. Two-day camping, raft, gear, all food supplied.
Cache Canyon Whitewater River Trips: (530) 796-3091, call in advance to book trips. One-day or rafting and a campsite are included in the cost.
For a sportier adventure, try renting an inflatable kayak. It will make your river experience just a little more thrilling.