Off the beaten path, but still popular
This campground is definitely off the main drag. It's not quite 4WD territory, but you will spend some time on a twisting bumpy dirt road to get there. Given that, we were surprised when we arrived to see that the campground was still almost full (we were, admittedly, visiting on a peak fall weekend). Despite being full, we found this campground to be much quieter than those lakeside. Maybe the folks dedicated enough to come up to Hanna Flat are cut from better cloth.
The grounds themselves are nice, if not exceptional. There's some hiking/biking trails available right from the campground, which is delightful, and the surrounding land was quite pretty.