Kiwis are pretty quiet, so you have to go out of your way to make friends with them. There's a big drinking/party culture, so if you're into that it's an option. I preferred to get outside and go tramping (hiking) and adventuring, so I joined my local church's tramping club. It's pretty easy to travel around New Zealand, but it can be expensive. Bookme.co.nz is a great option to get discounts on adventures like hang-gliding, kayaking, and ziplining. I would definitely recommend bringing lots of outdoor gear, since tramping is the best way to get to know people and see New Zealand's beautiful landscapes at the same time.