Hiking is permitted only between 6AM - 10PM. There are likely homeless camps abandoned with trash here and there as I have found throughout this park. I even find those green doggy poop bags everywhere along the trails. I did not encounter anyone while walking all around the area from the nearby road in the middle of the week. There are trails going every which way and thus I am sure you will find something unnatural along the way.
The black pointed tube cache is inside a small knot hole on a small mossy tree. Please return the cache to the same location that matches the hint and description with some camo covering to keep it out of plain sight.