Queenstown is the only gnarly place on my agenda. CAA require a sim check on it then a trip under supervision. Quite right, too.
Possibly this is only a part 121 requirement.
Not dissimilar to CASA's requirements for some RPT destinations, but currently under Aussie charter rules you can go anywhere without a prior visit.
The first time I went to Queenstown was a while ago flying a VH and because it was a charter we did nothing more than read all about it. Lucky the wx was good, hey?
In a perfect world CASA would see the light and adopt the NZ rules, then in theory we could just have a common licence. But wait, that would be too logical. The only practical reason why we couldn't is because 80% of our aerodromes don't meet NZ part 139 standards.