Re: favourable launch location in NZ
It is also about as far south as you can travel in the USA without having to invade somebody.
Launching from the equator is rather advantageous for most orbits.
It also has a large area to the east where it wouldn't really matter if you dropped a rocket - although the same could be said for everywhere between Pasadena and Boston.
The best strategy is remembering that you used to have a country named after you, almost exactly on the equator on the east coast of S. America and building a launch site there.