LIGHTHOUSE TOURS. Park rangers lead tours of the Au Sable Lighthouse Wednesday through Sunday from mid-June until the end of September. Each tour lasts about 30 minutes. Tours are offered at 11:00, 12:00, 1:00, 2:30, 3:30 and 4:30. Meet at the lighthouse. Fee is $3 per person for ages 6 and up (exact fee is required/no change available). The walk to the lighthouse from the parking area at Hurricane River is 1.5 miles, and generally takes about 30 minutes.