Fees are charged for cave tours and tickets are required to enter the cave. Tickets are sold on a first come, first serve basis on the day of the tour, and must be purchased on-site, in person, for same day tickets. Entrance to the cave requires a ranger-guided tour, and tour times vary by season (schedule). Cave tour tickets are limited by tour type and tours can often sell out at any time during the day. During the peak season or a holiday weekend, it is advised that you arrive in the morning to purchase tour tickets.