"As noted above, do not get cash in Australia"
The only caveat I would make to this is: watch the Forex.
I too have opened a Mac account just for the fee free ATM access, but I also grabbed a decent chunk of Yen, delivered to my local Post Office here in WA about six months ago, when the dollar was hovering around ¥108 for a short while, for a trip that isn't happening till March next year.
It's slipped about 15% since then, but if it does head above ¥105 again, it would be prudent to lock that rate in IMHO
YMMV, of course