BlueShift:pageweon: Tiritiri sounds like a zombie survival heaven! !
Except there's only bird-life there to hunt & eat - how many people can sustainably get a reasonable amount of protien from the resident kokako & kiwi? Other offshore islands would have bunnies, and other 4 legged protein-sources (Stoats, rats, goats, pigs, cats etc).
Depends what you class as a source of protein ... make sure you have plenty of "friends" on the island and they should last you a while!