As you approach GZ your first impression is to go up the front of this very large rock, but DON'T as the face looks rather unstable. There is easier access if you go down to the left ( Facing Lyttelton )of the base of the rock and follow that around.
This is a very tricky cache but will be easy enough for people with athletic ability. This area is dangerous, as are all hilly terrain caches - so do this cache at your own risk!
Take care - and enjoy the views.