Park $9 (per private out-of-state vehicle); $7 (per private in-state vehicle). Twin Caves boat tour $3. Children under 3 are not permitted on the boat tour.
Park open daily 7 a.m.-11 p.m. Visitor center daily 8-4. Twin Caves tours depart daily 9-5, Memorial Day weekend to mid-Aug.; Sat.-Sun. 9-5, mid-Aug. to mid-Oct.