I particularly wanted to cruise in Milford Sound and Fjordland - absolutely spectacular.
On a previous visit to NZ by bus, I was unable to get into the Sound as the road was blocked by snow - so the scenic cruising was a real treat.
The entertainment on this cruise was the best I've ever seen, especially the 'Encore' show, with visiting opera singers. I enjoyed it so much I went to both sessions!.
Clean, spacious and well maintained
I chose interior as I don't spend much time in the cabin - gives me more money to spend on excursions etc.