343 rooms. Open May 12-Oct. 29, 1998. The world's largest summer hotel. Classic elegant, inspiring. This 1887 hotel is famous for its 660-foot front porch overlooking Lake Huron. Beautiful gardens, wonderful food and service. Full breakfast and five course dinner included in room rate. Golf, tennis, croquet, bocci ball, swimming, bicycling, saddle horses, carriage tours, concerts, tea, dancing and more.