Three Choices Mystery Cache

THE CACHE IS NOT AT THE ABOVE COORDINATES!

You must solve the puzzle below to find the correct coordinates...

When I was growing up, I was always told I had three choices to solve any problem. Nothing was ever hopeless, you could ~
(1) do nothing (it's a choice): while this might be comfortable because of the familiarity, nothing changes.
(2) Do something drastic, go 180° from where you are: while this might be scary, some problems require radical changes. You do not need to be radical with this puzzle cache.
(3) Find a happy middle solution, you might want to explore this choice to solve this particular problem.

There might be other steps to take beyond three, but find those three and you're on your way.

For this puzzle, start with the grid below, and remember, for each problem you have at least three choices.

(Many thanks to my puzzle guru, named in the grid, for inspiration and for his assistance in conquering my fear of coded puzzle cache pages!)

(Checksum for all 15 = 55)

CONGRATULATIONS TO PARACELSUS AND BOODOGMAMA FOR CO-FTF!!

You can validate your puzzle solution with certitude.