Two words are synonymous with far northern California: mountains and water.
Shasta Lake is the largest lake in California, the Sacramento River is the longest river in California, and Whiskeytown National Recreation Area offers the only free kayak tours in California. Oh, and if you consider fishing a 'water adventure,' the Fly Shop in Redding is the largest commercial fly distributor in the world!
Rafting opportunities are plentiful thanks to an abundance of snow-fed rivers offering Class II to Class V rapids. If you desire something a little more relaxing, try a romantic river cruise or a leisurely float across Shasta Lake to view the Caverns.