From the original CO: "Lancaster Park is the original site of Lancaster School. Originally, this was a high school before the merger of Lancaster, Ossian, Rockcreek, and Union Schools to form Norwell High School."
I saw some trash around the tree while I was here, let's help keep the park clean by picking any more up.
Look for a camo'd matchstick container. Please remember to close it tight to seal the o-ring and keep water out.
CAUTION: There may be some poison ivy in the overgrowth.
WARNING: The hint is a spoiler.