When I came by here, the ground under the oaks looked like it
had been torn up by wild pigs. There was also a large metal cage
baited with corn and other pig delicacies. A trip wire near the
food was attached to a rod holding up the door. However, the door
was wired open, so this was evidently a test, and the rangers
weren't yet committed to coming out here every day to check.
Update 9/17/05: The pig trap was still there, but the cache was
gone. I replaced it with an ammo box in a new spot and updated the
coordinates and the hint.