On the east side of the park: there is a pile of stuff to the right of the main trail down to the JC by the fallen tree. (pic 1) There are several piles of trash just on the other side of the rail at the north end of the parking area. (example: pic 2).
On the west side of the park, we saw someone hide stuff over the fence near the restroom. There is a pile of stuff at the south corner of the fence by Crystal Springs Creek on the creek side of the fence (pic 4). There were 2 large trash bags (maybe filled with cans?) and a bike with wheels removed near the picnic table by JC. (pic 3) We thought they may be associated with the person we saw on the rocks in JC nearby.
For some reason, this form did not accept images 3 and 4.