Castles, wealth and water. That's what this informative 3-hour tour on the St Lawrence River is all about. Cruise the wide, island-filled river, puttering along the Canadian shore as a guide describes the intriguing history of the area and some of the rich and famous people who have settled here through the decades. Dock at Heart Island and walk to where the imposing Boldt Castle sits. Take a self-guided tour of the castle or just explore the island before getting back on the boat and returning to Clayton.