Not sure if you realise but Sydneys a BIGGGG place.......now if you are staying with your kiwi brothers in the eastern suburbs, you could go and see Belly in Rose Bay (OzSup) he can hire you a board I reckon, but if your staying elsewhere we can give you some other tips........
Also do you have wheels? I haven't tried it but SUPs on the trains don't normally work

And if you are in Sydney and Free on the 15th you could go to the Naish River Race..........top SUP day