There's just so much here, it's awesome! Wellington's a huge cultural capital, and there's more restaurants per capita than New York! Milford Sound's absolutely stunning and you should definitely visit :P There's also a whole bunch of "Great walks", where you hike through native forests and landscapes! And Zorbing! Zorbing is just the best, and you should totally do it! Visit Hobbiton, and a whole bunch of other Lord of the Rings locations! You could go and see some Māori stuffs too, it's really interesting! And that's all I can think of, but there's tons more :P