GEORGIAN BAY, TUCKED into Ontario's Lake Huron, is a bit of a misnomer. At 5,792 square miles it's not that much smaller than Lake Ontario (7,320 square miles), earning it the nickname "the sixth Great Lake." With more than 1,240 miles of grayish-pink granite shoreline, it is part of a UNESCO biosphere reserve and a summer freshwater playground for boaters, anglers, and kayakers.