If you are a tourist and travelling near the area... this is the way to go. We didn't know there were so many tour operators with such a diversity of offerings and quality. Spellbound offers only 12 person tours with 3 different guides, 4 times per day... each lasting 3.25 hours. This includes 2 caves each 45 minutes each. The first is glow worms and is amazing. first you walk (easy), then on a boat. They give your eyes time to adjust so you can really see the glow worms. Our guide was very personable and knowledgeable. Strongly recommend this is the way to go when considering the alternatives in Waitomo.