Based on your description I know exactly where you ran. I used to run through there if I did a run a lunch from Christie. Back then I only every saw one person (although I saw him almost every time because he was sneaking in there to drink at lunch). Then 1 day all of a sudden it was full of tents, etc. Started skipping it for a while, went back one day in the winter because I was curious and yeah now it's just full of garbage.
Yep, that's the spot! I've seen the trails as I've driven by and always been curious about what was in there. There was at least one active camp with a person in it, and then just lots of evidence of past residents. Cute little forest otherwise!