Duke Cannon Has a Port of Call. When Duke Cannon wants to take the plunge, an over-chlorinated community pool simply won't do. Instead, he heads to the crisp, cold waters of the world's largest freshwater lake to invigorate himself. There, among the lake trout and freighters full of iron ore, he boats, swims, and fishes until his fingers prune. With scents of fresh water and neroli, Superior smells like the rolling waves of a Great Lake, not low tide in Perth Amboy, New Jersey.