Well,
Yep Melbourne is obvious because it is the centre of the pinny universe but thinking out of the square.... why not go to a Whitsunday island just full of pinball machines, sun and sand and booze 24/7. If not Hammo, then South Molle (just the right size and room for this sort of thing). They already have a few pinnys, last time I was there was a TAF and Roadshow.
Also, no having to drive home, just flake on the beach, no cops or fines, nice looking broads.
Also, it close to my place!!!