I have alot of mates in melbourne and they absolutely love it. Sure they come up to the north coast of new south wales and south east queensland but at the end of the day they always end up back home.
The cultural scene around melbourne is second to none mate. It has some amazing jazz clubs and underground left hand music bars. If you're that way inclined you cant go wrong. The women you will find are very mixed, from the "pool-cue-in-ass" type to the "wheres-the-closest-bed-or-simlar-object" so you'll have fun sussing that all out, and if you can serenade them then you are halfway to finding their clothes on your floor.
Ive never fished down there but landbased you will have a ball fishing for salmon with flies. Try your finger length floating popper flys in whites or blues as the salmon as regularly feeding on small whitebait near the surface. They're rats**t to eat but god do they fight hard!
Goodluck with the move and i hope its everything you hope it'll be. And who knows, you might even end up flying up one day.
Just remember, RE: the marlin query, we have such a large number of marlin in our waters that they are even regularly targeted off the shore in parts of new south wales to about 80-100kg.