While I was setting up this cache I had to walk over a bridge to get to stage one that looked to me like a Hersey's chocolate bar.
Take a moment to stop and look down when on the bridge. You will need to find out how many small rectangles there are in each larger rectangle which then make up the planks themselves.
The sum of that number will be needed to unlock the final coordinates.
Stage one ain't a piece of cake either, please have patience and leave as you found so the next person can experience the same (frustration) as the person before.
You can validate your puzzle solution with certitude.