This is a letterbox, please don't take the stamp
The posted and final coordinates of the letterbox are the same.
The holes left by the horses can be rough
ODNR Permit EF-04-14-24
See https://coord.info/GCARY9Y for parking and trailhead info
Here's a great park map https://drive.google.com/file/d/1vN-M0wnOxctzyuZbwmqZ-M6wVak81Z9Z/view?usp=sharing
You are looking for a metal water bottle among some small logs.