Standard, quiet campground
Disregard the "closed for the season" post in the name - this campground is open.
There are a few campgrounds in this area of the Angeles National Forest. Horse Flats is not as popular as Buckhorn, and is a little less "green" with regards to the immediate scenery. It is also quieter for this reason, which is nice. The individual sites are large and spread out from each other, so it is easy to have some privacy. Make sure to get food and firewood before you start the drive up the mountain, as there is no place to purchase such supplies near the camps.