Hop on a huge ferry boat, and after a 20-minute ride through the choppy Lake Erie waters, you’ll arrive at the idyllic Kelleys Island, about 4 miles north of Marblehead, Ohio, and the largest American island on the lake. The island is home to about 140 year-round residents, though the population swells to well over 400 residents and 5,000 tourists during the busy summer months.