Lovely Lake Michigan is the lone Great Lake located entirely within the United States and is the fifth-largest lake in the world. 307 miles long by 118 miles wide, with a shoreline 1,640 miles long, the lake is our city's deep blue gem. While you can always stroll along the beautiful lakefront or swim at one of the many city beaches, why not hop into a kayak, step atop a paddleboard, snorkel, scuba or even surf Lake Michigan? Here are five unique, active ways to experience Chicago's beautiful stretch of Lake Michigan.