The cache is only 200 metres from the suggested parking coordinates (vertically).
Enjoy a short, steep walk and be rewarded with views down the valley to the city. Recommended at sunset. Kangaroos and deer are likely to be spotted.
Your best approach is to take the Pengana track and then the small foot track that takes you up on to the top of the ridge. DO NOT consider approaching this from the valley below.
WARNING: There are steep drop-offs just beyond the cache. Be careful near GZ, you can safely extract the cache without the need to hop down onto the rocks.