GZ should bring you up against a fence. Access to the cache is on the park side of the fence. The owners of the fence have given permission and are geocaching-friendly. If you see them, wave, say hi, and feel free to tell a geocaching tale or two.
You will need stealth, especially in winter as the hill nearby is popular for tiny muggles and their toboggans.
Pro Tip: The cache is a small bison tube and putting the log paper back into the bison tube can be challenging and messy when not done right. To avoid destroying the log paper, take the log paper and roll it tightly. Then, place it in the lid of the bison tube. Then carefully slip the other end of the log paper into the bison tube and securely screw it together. Leave the wire hanging out and down so others can grab the cache.
BYOP.
The hint will help new and less experienced cachers.