What I didn't realise is that there is different type of sites. "Traditional" - just a box, "Multi" - the first box contains clues to find more box/es, "Earth" - where you learn something geological, "Puzzle" - where you have to solve a complex number orientated puzzle to find the box. It goes on. We found 5 sites in our relatively short walk along the Wellington skyline, see maps, so these boxes are everywhere around you!
Mark is on of those who gets texts on his cellphone and races to get new caches placed near where he lives. He described vividly a sleepy drive to Ekatahuna in the middle of the night. Whatever gets people out in hills enjoying nature is a good thing!