By Len Ziehm     There are a host of reasons why people take the 20-minute boat ride from Mackinac City, or St. Ignace to the island every year, May through October. Mackinac Island is a lot more than just the Grand Hotel.     Every day during the summer, up to 15,000 visitors shop at the intimate stores, dine at one of the many intriguing restaurants, bike around the island, enjoy a peaceful carriage or horseback ride and explore the historical […]