Red Bluff Municipal Airport

Nice airport and easy to find. The FBO is run by a couple retired guys who are easy enough to get along with. $5 ramp fee if you stay overnight. They'll waive it if you buy fuel. Enterprise rental is a couple blocks away and they'll pick you up at the airport. Lassen Volcanic National Park is about an hour's drive away and a great destination for backpacking or even a day trip. It can get HOT in the afternoon so check density altitude and your performance charts.