Along the Djerring trail, somewhere to park your bike to catch the train, or to have a break if you've been riding along the trail. Coordinates are very difficult here due to probably electromagnetic inference.
Look for this frog across the Road from GZ - the cache is 29 m directly North of this frog to give you some bearing.
( previous reference point - Look for the lady to help you - STOP PRESS - the lady has been erased- but I'll keep her here for prosperity )
The Cache - you are looking for a plastic tube container well hidden in the crack complete with log and pencil - check the hint and watch the muggles and the cameras in this busy place. Choose your retrieval time and place it well hidden as you found it. FTF went to n0w0rries + wife.