Okay. I promised an update, then I completely forgot about it...
When I was in New Zealand, I did enjoy quite a few adventure activities, though they weren't necessarily scary.
First of all, going on the trip itself: first road trip ever, in a large vehicle and with only one driver, me (my boyfriend doesn't drive). I had no experience with large vehicles AND could not drive a manual car - I took some lessons before the trip, but I was scared to no end about driving in NZ. So I guess that's an adventure.

It was really scary when we first got the vehicle (large campervan), but I got used to it very fast.

We also took it on a ferry, and driving a car into the ferry was quite something...
So here's what we did in terms of adventure activities:
- black water rafting (you float through a cave on an inner tube, with just a small headlight)
- zorbing, which is a crazy/weird/innovative Kiwi activity, where you roll down a hill in a huge plastic sphere
- walked around geothermally active areas, where the Earth's surface is very very thin, and while we weren't worried, there were "DANGER" signs everywhere
- trip to an active volcano-island (White Island)
- swimming with seals, swimming with dolphins and whale watching (all separately)
- walk on a glacier
- lots of small and large swingbridges, and I went on a flying fox over a 110 metre long swingbridge
- and lots of other fun, but probably not so adventurous things
That's all I can remember at the moment...