We are going on a 12 day great barrier reef cruise in December on RCCL's Rhapsody. This cruise included round trip airfair from Minneapolis our departure city to Sydney.
In yesterday's travel zoo internet top 20, the cruise reseller Crucon has a 15 day cruise on Celebrity leaving Honolulu and included return airfair from Sydney. What caught my eye was they are sailing through French Polynesia and I think also NZ. Go to crucon's website for more info. I think they only have 50 cabins available with the included air.
If you are interested in the great barrier reef, once in Sydney our cruise is only about & $900 for 12 days.
This looks like a great way to get to AU from the USA if you ask me.