This hide came from a recent visit to a nearby cemetary cache by (CP590). My son and I have done dozens of hikes in Mill Pond but always through the conventional entrance. During the cemetary cache, we found a beautiful back area of Mill Pond, filled tons of hidden treasures and even cooler trails.
Part of your hint is in the name. Heads up that you will need to cross over a few man made bridges to get to the final spot.
Congrats to BENJIWINKS & DarlaWinks for the FTF!
*You're looking for a small black bison tube. Don't forget to BYOP.*