After reading this case and that the park was somewhat well visited and a place for teenagers I had my thoughts leaning more toward them secretly arranging to meet someone.
Girls and boys at 13 are awkward looking and know it and it takes a toll on their self-esteem-especially for girls. They also still think like children in their maturing bodies and do not always imagine the consequences of their actions.
This is why so many predators seek this age group because they can manipulate them and know they are old enough to successfully hide things from the parents and would not mind hiding some things as much as younger ages. The breaking away from authority is also something else going on which sucks for parents.
One or more manipulative pervert could talk them in to meeting. He gets there before they do, sets up his camp or whatever out of the way of hikers and gets them to go there. Probably gives them some alcohol or drugs to subdue them or just one and then has a couple hours to take his time with them. He could be behind the camera for all we know.
Just speculating here but I was thinking whether they knew the POI online or in person they knew him somehow.
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I'm thinking the same thing. Someone they met online or possibly older guy from the area.