Driving in NZ is easy, you can average between 45 and 55 mph (less photo stops) in the South Island. There are less than 4 million people here, and about 60 - 70% live in the top half of the North Island. So you should have a good opurtunity to look around.
Definately go see Wayne, I will next time I am on the Coast.
And Wayne, my grandfather used to own the Australasian Hotel in Greymouth.
And if you are anywhere near Wellington, let me know.