Beautiful weekend in Henry Coe State Park! I just came back from a quick overnight backpack to Coit Horse Camp. (I have some friends planning a five day, high altitude, trip in the Sierra. I haven’t done much backpacking in recent years, so this was a little test.)
Strangely, while sleeping at Coit Horse Camp, I woke up several times during the night to faint techno/rave dance music!?! I listened for someone coming down the trail, and also tried to figure out where there are nearby private lands, closer than Coyote Lake. It seemed to be very distant, to the south or west, fading in and out. Puzzling!!
This morning, on my way back to Hunting Hollow, I found the answer at the green bridge, ~4 miles down the valley: a box from a turntable/media player, a new campfire site at the bridge, and assorted litter and beer cans. 
😢 (see last photos).
AlphaRoaming 