Discovery Center free. 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).
Mon.-Sat. 10-5, Sun. noon-5, Memorial Day-Labor Day; Tues.-Sat. 10-5, Sun. noon-5, day after Labor Day-day before Thanksgiving and Apr. 1-day before Memorial Day; Sat. 10-5, Sun. noon-5, Jan. 2-Mar. 31. Allow 1 hour minimum.