Chena River is a 70 mile moderately trafficked out and back trail located near Fairbanks, AK that features a river and is rated as moderate. The trail is primarily used for whitewater kayaking and is accessible from June until September.
It is great for kayaking or canoeing. I did about 50 miles on it in a canoe and it very scenic. We saw lots of bald eagles and moose. My only complaint is that there are many dangerous sweepers during some of the fast parts. Overall it is great.