"Others are, and in my list you need to be able to walk easily to all....."
Joel Stewart
By your measurement, the following might easily apply:
Royal Melbourne West & East
Kingston Heath
Metropolitan
Victoria
Commonwealth
Yarra Yarra
(Mates...help me out and re-organize them into "adjacent" distances.")
I do know most of them are withing some measure of walking from each other!
Golf nuts are so quick to forget, ignore, or simply exclude the Sandbelt (mostly due to never having seen it). My good fortune to have played some of these reminds me every day that this is the GREATEST close-by concentration of fun, style, playability, and test on this planet!!!
I would venture to say, that given the recent inclusion of Barnbougle Dunes and St. Andrews Beach, the rough stretch from Adelaide, east to Tasmania, north to Sydney has the blows California, the East Coast of the US, and all of Ireland away....only leaving Scotland to give it some run.
Make like Magellan and hurry up down there!!!