At GZ you should find youself just in Greenwood drive public park. Further along into the park you have a playground, barbecues, tables and toilets. Also you can find one of the entrances into Greswell Forest reserve. There are plenty of kangaroos in Greswell and I have seen the occasional echidna. I also have it on good authority that there are 3 different species of owl there. Back to the public park, when I used to pass this way early in the morning it wasn't unusual to see foxes and a couple of hares.
Now to the cache. You are looking for a micro, as mentioned, that should (I hope) blend in well with it's surroundings. A pencil has been supplied but it is always advisable to BYO writing implement just in case. Being a micro there is no room for swaps etc. Also you may require a tool to help extract the logbook