Horse Flats is a popular campground deep in Angeles National Forest.

There are a bunch of sites (more than 20) and there are vault toilets, fire pits, and picnic tables.

$12 fee per site, not sure how many cars that means but you might need the adventure pass if you have a lot of other cars parking overnight.

It's a great escape from the city, about an hour from DTLA. Popular with climbers as there's bouldering in the area.

Know before you go - it's closed from November-ish to April-ish - so check the forest website before you head out there.

When driving there, you take a left off the 2 and it's a little past Bandido Group site. Some people have a hard time finding it their first time going.