Went to South Island for 3 months 2 years ago during the earthquake. Was in christchurch sleeping when that happened. Well to be honest, when you are in NZ, even taking snapshots with your iPhone would be simply amazing. Just to comment a little on your photos, you might want to tone down on your HDR processing. Some of it really makes your pictures looks really fake, or simply too over-done.
Well if anyone wanna know what to bring, definitely bring a steady tripod, UWA, and a car (rent). I stop every 5 minutes because the view is simply fantastic.