A trip that is on our Bucket List is: Australia, NZ and some suitable island in the south Pacific.
Since Australia is a really big piece of land we're probably limited to parts of the QLD and NSW coast and perhaps also a bit of SA and VIC, and just maybe a hop to Tassie.
Not a two-week trip, that's for sure. I figure that two months is realistic. Then there is the question of cost, and a trip like that is not cheap. Time will tell...