
You won't find any monuments on the Saint-Louis island, but we will see many beautiful houses from the 17th and 18th century. Also on that island will you find the best ice-cream in Paris in France in Europe!
I can already hear the Italians screaming! They may have very good gelatos but Berthillon has sherbets to die for... And I know a trick to get some during the tour without lining-up for 30 minutes...
Otherwise, the tour of the island can be done in half an hour (before or after Notre-Dame).
Add 5 mn (at least) for savoring the ice-cream...