Cedar Lake is in the Mission Mtn. Wilderness about 15 airplane miles NW of Condon. My first visit to Cedar was about 15 years ago; I revisited just a few days ago. Both my trips were day hikes but this time I took notice of some good campsites just south of the lake. It appears that it is used by horse packers. We saw a horse group coming out as we were going in and we saw another inbound group of day riders going in as we were exiting. A backpacking couple was coming out as we headed in.
It’s a very pretty area, not a tough walk. We used the Fatty Creek Road to access the lake from the north. It involves a 9 mile drive on mostly decent gravel road though there are some rough spots. My 20 year old sedan had no difficulty. A good map or GPS is useful for finding the trailhead as many connecting roads lead in different directions and not all of them are obviously signed.
Good luck and let us know what you finally choose as your destination.