Tickets are purchased at the ticket center - $20 NZ for the Glowworm Cave or $30NZ for the Glowworm Cave and the Aranui cave (see separate review). When busy, you are given a time for your group, otherwise you would just go to the entrance and start when there are enough in your group to start. There are guides that take you through the caves and explain a lot about the formation and history of the caves and various facts about the glowworms.
The main glowworm cave has a large cathedral which has hosted many musical performances. After about a 15 minute walk through the cave with your guide you come to the section of the cave where the glowworms reside. This section of the cave is flooded and you ride through on a raft. You are warned to be very quiet as noise apparently disturbs the glowworms. The raft slowly passes through this section and as you round the first corner it suddenly seems as if you are outside on a perfectly clear star-filled night. Thousands of little glowworms are above you lighting your artificial sky. The raft carries on through this section and you arrive at the end of your journey.
As with all good tourist stops there is the obligatory gift shop and cafeteria-style restaurant. The gift shop does have a few unique items relating to the glowworms as well as a good stock of New Zealand tourist items.