A 45-minute Batorama river tour around the historic island called  La Grande Île is fun, informative, and a chance to rest your feet. The bateau-mouche-style excursion boats are heated and air-conditioned, but if the weather’s fine, choose the open-air cruise. From May through September, you can hop aboard as late as 10 pm for a sunset tour along the Île River. Pick up tickets...