For my second cache, I was surprised to discover this small reserve has no cache nearby. Old Joe's Creek Reserve is a retarding basin and home to the sword-grass brown butterfly. It also features natives including Pea, Heath and Fuschia. If you'd like more information on this reserve and others in the Knox area, try: http://www.knox.vic.gov.au/Files/Environment/Bushland_Reserves_in_Knox_Brochure.pdf
You can park either on Debson Close and enter this reserve from Dorset Road or alternatively, park and enter from Army Road (waypoint refers). There's a small playground at the Army Road entrance but either way, GZ is within a kilometre away, on a fairly wide gravel path.
The cache is a 400ml sistema container, stained to dull the plastic 'gloss'.
Congratulations kittycatcoco for being FTF.