My family and I camped at William Heise Park for two nights in mid-June 2020. The campground is pretty and has a nice secluded, mountain feel about it (even though it’s close to Julian). We were surprised by how dispersed the campsite loops were and how deep the campground went into forest. There is also surprisingly good cell phone coverage throughout the grounds. We stayed at site 90, which was at the very back of the tent-only section at the end. Due to all of the oak trees, most sites have good shade. We didn’t see wild turkeys or mule deer during our stay, but there were plenty of birds and a few squirrels. There were also a LOT of flies- especially crane flies. The bathrooms and showers were usually full of them, but they also made a significant presence at the campsite. Even at about 50% capacity the tent-only section felt felt busy with lots of families and small children. The loops closer to the entrance seemed quieter. However, it was nice to be near the trailhead for several trails and there’s also a water bottle refilling station right there. The terrain is beautiful all around. We definitely want to stay again.