Guided 60-minute tour $9; $5 (ages 5-15) $4.50 (bearers of Golden Age or Golden Access senior passes). Guided 90-minute tour $11; $6 (ages 5-15) $5.50 (bearers of Golden Age or Golden Access senior passes). Under 5 are not permitted on the 90-minute tour Mar.-Oct.
Guided 60- and 90-minute cave tours are given daily year-round. Tour times vary; phone ahead. Tickets may be purchased up to 6 months in advance, or at the visitor center the day of the tour; advance purchase is strongly recommended as tours frequently sell out during the summer. Closed Jan. 1, Thanksgiving and Christmas.