Sometimes you have to do something illogical to make the most of things when travelling, and so it is as we leave Rotorua to head to our next destination, Taupo, via a somewhat staggered route. The most direct route would be less than 100km but a detour west is the only way we can take in something which we want to see, so we dogleg our way across to Waitomo and then back across to our next base. What attracts us to Waitomo is the cave network in the hillside which is home to a particular species of glow worm, the arachnocampa luminosa, and seeing them turns out to be…