Free. Institute $1; 50c (ages 0-17).
$6-$10 per private vehicle.
Park open daily 8 a.m.-half-hour after sunset. Institute open Tues.-Fri. noon-4, Sat. noon-4:30 (also Sun. noon-4:30, Easter-Labor Day, and on Memorial Day, July 4 and Labor Day). The park may be closed at times June-Oct. if brush fires are present; phone ahead for updates.