$5; $3 (students ages 6-18 with ID); free (ages 0-5); free to all the 13th of the month. Reservations are recommended.
Tours depart from the Education and Visitors Center located next door Tues.-Fri. at 9, 11, 1 and 3 and second Sat. of each month at 9 and 11. Closed major holidays. Allow 1 hour, 30 minutes minimum.