Save this July and August at the Grand Hotel on Mackinac Island, Michigan.  Stay two nights and get the third night for half price, or stay one night and get the second night 25 percent off on select nights with their Family Added Value Days.  Accommodations, daily breakfast, five-course dinner, free admission to the Richard and Jane Manoogian Mackinac Art Museum and a special discount on ferryboat tickets are all part of your rate. Half-off golf for adults and free golf for children under 17 years old are also included.  Your family can also enjoy the Esther Williams pool (one of her movies was filmed at the property), kids club, lawn games, nightly movies, tennis, spa, horseback riding, biking, island carriage tours and more.