Due west of Chico, about 12 miles on the west side of I-5 is Black Butte Lake. It has two ACE campgrounds, this is the secondary one, it closes in early September. It's a few miles closer to Orland and on a bluff 100 or so feet above the water. Very pleasant.
On the McCloud River, within hiking distance of the three waterfalls. Apparently heavily used in the swimming months, but pleasantly uncrowded tonight. The hike to Lower Falls is less than a mile and very scenic. Hike to Middle/Upper Falls is a little more than a mile. You can walk the paved road back to make it a loop if you wish.