Free. Educational presentations $7; $5.50 (ages 0-15); $25 (family, five people, with no more than three adults).
Hours: Mon.-Sat. 8-7, Sun. 9-5:30, July-Aug.; Mon.-Fri. 8-6, Sat. 8:30-6, Sun. 9:30-4:30, May-June and Sept.-Oct.; Mon.-Sat. 8:30-5:30, Sun. 9:30-4:30, rest of year. Educational presentations daily July-Aug.; Sat.-Sun. in June. Hours vary; phone ahead. Closed Christmas and day after Christmas.