Christchurch
Christchurch seemed a really lovely city however we visited about 6 months after the last major earthquake so the main part of the city was still closed off to the public. Public transport there was excellent as you only paid $2 something for a bus ticket which you could use again within 2 hours for no extra cost (within Zone 1 - which is massive). People of Christchurch were some of the nicest we've ever met. They were really friendly and helpful despite all the devestation around them.
Insider Tip:Check that the city is open to the public if you're looking for a party. Worth a visit to look at the beautiful architecture that is still in place in some parts and if you're missing England (Avon River)