Hahaha yes it's so difficult to choose. There's the Waitomo Caves on the North Island (pretty close to Auckland), where you get to see glow worms or do black water rafting in the caves. There's also Cape Reinga - the tip of the North Island - you get to see 2 oceans meet. But the South Island is where the really spectacular scenery be at. Let me know if you visit NZ, if I'm in town I'll be happy to show you around! <3