"One Tree Hill" got canceled in 2012. The tree on the hill in Auckland got canceled back in 1852, which was then replanted and finally cut down by activists in 2000. People always assume there is a tree at the top, one of Auckland's top sights. In fact there is just a monument to the Māori who got slaughtered here back in the ignorant days. You don't HAVE to go to the Cornwall Park to discover the volcanic fields. I have been to many mounds around the city without even knowing, but here is where they actually point it out with some nice signs, also known as volcanic cones. This is also Auckland's second-largest volcanic field.

Even the documentation says this isn't unique, and wants to represent it as a mixed cultural landscape, having Māori live in this kind of environment. For that you'd have to go see something like the Ōtuataua Stonefields. While not much to see and not the top sight in New Zealand you may be seeking out, it is one of the best examples of how the settlers adapted to the climate. The stone-walled gardens would warm the soil and extend the growing season.

I don't see this as a proper WHS, similar to the Philippines' Chocolate Hills - nice to view but not that special, and would only work with the cultural mix which I don't see represented enough, especially with many of the cones already destroyed over time.

Not something I would recommend to do but if you have an extra day in Auckland then why not.