Waikato

2 hours west of Rotorua, the Waikato region is famous for its extensive cave system. And this being New Zealand, the Kiwis have naturally found some way of turning cold, dark caves into an adrenaline pumping experience. They call it "Black water rafting". It involves getting dressed up in a wet suit thick enough to make you look like the Michelin Man, putting so called "Goofy boots" on, sticking your arse in a tractor inner tube and throwing yourself into the river that flows through the cave. The water is cold enough to leave you wondering if you are still a man when you get out 2 hours later, but it is still a great buzz. The caves are mainly famous for their Glowworms which are all over the place and one of the most spectacular moments involved turning our helmet lights off and just staring at the roof of the cavern. It was honestly like looking at the night sky. A veritable Glowworm Milky way.