This is a letterbox, please don't take the stamp
At the listed coordinates you will find a sign that will help you determine the final coordinates for the letterbox.
The final cache is located at:
N39 16.80Q W84 24.XY9
The harbor trail is X.Y miles long.
Sharon lake is AB acres Q=A+B
Sum check Q+X+Y= 16
Hint: behind locust tree.