You are looking for a micro cache in Forest Park. GZ is near parking on a dead end street, or you can access this area by a very nice running, walking, biking path. You can not get to this cache from the highway because of a high fence.
From GZ if you look to the north you will notice the baseball field, and that this location is where the right field bleachers would be, in deep right field. This cache is a pair with another nearby cache with a baseball theme.
Good luck finding this cache. Enjoy the park, the view, and the green grass of right field. Happy caching!
Congratulations and FTF honors to gustocashe and stlbarb