Mills Canyon was an absolutely beautiful campground. I had the place to myself, but that’s because it was too hot for most sane people to stay longer than a few hours. There was one car that drove through to use the bathrooms, but I had the entire campground to myself. It was incredibly hot, so my advice for anybody who is coming to this area during the summer months is to bring way more water than what you think you need, and some type of canopy for shade. I only stayed one night as it never cooled down and the biting insects were terrible. All that said, I will return in the cooler months. No cell service. The road down into the canyon was fine with a few legit ruts but easy to navigate.