Buy a baguette with ham and cheese *Jambon-Fromage* from a street vendor, you will want to eat one every day.
No. The crêpe stands. A crêpe jambon-fromage for lunch everyday = HEAVEN. Or ten or all day. You can't eat Paris better or cheaper.

Le Musée d'Orsée for the WIN!!! If you want a college course in 19th Century Art in 2 hours, you get one right there! And makes you understand Modern Art by understanding its foundation by leading you from Neo-Classicism to Impressionism to Exopressionism to Abstract Art.

While the Louvre is a dizzying display four paintings tall of every kind of Art. You end up like the Griswalds doing the Louvre in an hour or two. "Look at that!" "Look at THAT!!" "WE have ten minutes left, let's look at the ancient Egypt art in the last ten minutes left we have!"