Free. A fee may be charged for special exhibitions.
Park open daily 8 a.m.-30 minutes after dusk. Museum open daily 10-6 (also Thurs. 6-8 p.m.), Memorial Day-Labor Day; 10-4, rest of year. Walking tours depart the first Sun. of the month at 2; stroller tours depart the third Thurs. of the month at 10 a.m., May-Oct. Evening stroller tours and tours for visitors with memory loss also are offered; phone for details. Phone ahead to confirm schedule.