Quinn River is a good campground like qwapaw mentioned and also the Crane Prairie campground on the other side of the lake. Also there are campgrounds at wickiup and south twin. I only go to the "free" campgrounds, because I am poor. If you drive around the dam at Crane you can find some forest service land you can camp on for up to 14 days. Also Wickiup has the same thing if you keep driving around dam to the rest of the lake. These are unimproved sites, but are free. Also Big Lava could be fun and it has a campground if you want to fish a couple different lakes. Don't forget Davis if you are a fly guy and you want to catch some bass and maybe a trout.
Good Luck,
Fisherwilly