It's a good decision if it will help you meet your career goals.
However - I don't know of any internationally-accredited MBA programs in either of these two countries that have a specialization in tourism.
It might be better to do a general MBA at an accredited business school, rather than something specialized at a not-so-good school. For Australia check out AGSM or Melbourne Business School, for NZ look into Otago.
It's a good decision if it will help you meet your career goals.
However - I don't know of any internationally-accredited MBA programs in either of these two countries that have a specialization in tourism.
It might be better to do a general MBA at an accredited business school, rather than something specialized at a not-so-good school. For Australia check out AGSM or Melbourne Business School, for NZ look into Otago.