Park entry requires a Recreation Passport (valid for 1 year and allows entry into Michigan state parks) $11 (per private in-state vehicle); $5 (per in-state motorcycle); $31 (per private out-of-state vehicle). Nonresident single-day pass $9 (per private out-of-state vehicle). Museum admission is free.
Daily 10-4:30, Memorial Day-Labor Day; Sat.-Sun. 10-4:30, day after Labor Day-Oct. 31. Phone ahead to confirm schedule. Allow 30 minutes minimum.