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Delta Queen. America's only authentic paddle-wheel steamboats offering overnight trips begin cruises lasting from three to 14 nights from the riverfront. Dock below Gateway Arch, St. Louis, MO. 800/543–1949. $500–$2035. Daily.

Mississippi Queen. America's only authentic paddle-wheel steamboats offering overnight trips begin cruises lasting from three to 14 nights from the riverfront. Dock below Gateway Arch, St. Louis, MO. 800/543–1949. $500–$2035. Daily.

Gateway Riverboat Cruises. The Tom Sawyer and Becky Thatcher are docked here, providing the longest-running sightseeing excursions of the St. Louis riverfront, including Dixieland jazz dinner cruises. Dock below Gateway Arch, St. Louis, MO. 314/621–4040 or 800/878–7411. $9–$32. Mar.–Dec.