Go on the Louvre internet site. Pick 5-10 of the treasures you most want to see. Map out your tour route in the museum, because it is incredibly large. It is also the most magnificent collection of treasure I've ever seen, including the British Mueseum in London and the Metropolitan in New York City. After that, if you have some time, walk out onto the Champs Elysee, the world's prettiest boulevard. Have a coffee and watch Paris walk past you.