$4; $2 (ages 7-12); free (first Sun. of the month, excluding holidays).
Daily 9:30 a.m.-10 p.m., Memorial Day-Labor Day; daily 10-8, May 1 to day before Memorial Day; daily 10-6, mid-Apr. to late Apr. and day after Labor Day to Sept. 30; daily 10-5, Apr. 1 to mid-Apr.; Sat.-Sun. noon-4, rest of year. Phone ahead to confirm schedule. Allow 30 minutes minimum.