Cadbury's is rather local... they make it southeast in Dunedin. When I took the tour, they mentioned that NZ Cadbury used more milk than other worldwide versions. Here in the U.S., I avoid the Hershey's version and buy the bars imported from Ireland. Regular Hershey's? BLECH.
Beer is quite good, but I prefer cider. NZ has great produce!
When I toured the country in 1994, there had been torrential rains and floods on the South Island. Consider flood plains when buying property.
Queenstown seemed a bit like a Colorado ski resort town. There is a lot of tourism year-round.
Here's a bit of local lore on Wakatipu:http://www.queenstown.nz.com/lake-wakatipu.aspx
You may wish to purchase a pair of red socks.http://www.teara.govt.nz/en/sailing-and-windsurfing/7/2
There's also the Olympics this year. In the past, New Zealand has done well in cycling, rowing, and sailing.
Myself, I left my heart in Wellington. Back then there was a point system... I was not a refugee, had just graduated and thus no job experience, and was not rich.
Oh, and they drive on the left. Which means when you cross the street, you must reverse your usual technique. Look right-left-right on a two-way street.