Centennial Park is a 3.5k road loop in Sydney’s Eastern suburbs. The road is split 50/50 for bikes and cars with a 30 kph limit. It can be a bit of a poser fest, but it is flatish, away from the traffic and it is easy to meet there.
I’n not sure if all the Sydneysiders are on Farkin, but there are a couple of Sydney based Fixie riders and a few more singlespeeders who may be up for some road riding (although maybe no by the looks of the thread so far ).