Michigan’s Heritage Park in Whitehall OPEN for the season on May 2! During the month of May, the park will be open weekdays from 10 am to 4 pm. The park will be open on Saturday, May 21 from 10 am to 4 pm as park of a Be a Tourist in Your Own Backyard promotion. Beginning June 2, the park will be open Thursday through Monday from 10 am to 4 pm and Sundays from 1 to 4 pm. During October, the park will revert back to the weekdays only schedule.