So, having driven by this park numerous times I finally decided to stop. I was pleasently surprised to find an Austro-Hungarian fortification. I highly recommend stopping by this park, oh and finding this cache.
Being heavily covered in trees, I am not 100% positive on the coordinates, but the hint and spoiler photo will ensure you are in the right spot. FYI, you will have to climb quite a few stairs to get to the cache. Enjoy!