You are looking for a purple bison tube. How hard could that be, right?
My buddy ProgKing discovered that the park has gates that come down during off hours. Not only is there no night caching, but they enforce it apparently. I didn't know that. Here is your notification. Plan accordingly.
Although my coordinates are not perfect (based on satellite imagery), if you're going farther than ten feet away from the coordinates, you're too far away.
