Need help planning

My DH,DD(20), and I are planning a short trip to DLP/Paris before going to London next year and I need some help. We will be staying at DLP (using DVC points), but are unsure should we do 2 days in Paris and one in DLP(MK only) or vise versa. What is the best way to go into Paris, and are the various Paris passes worth it? I know the Louvre is free that first Sunday we are there, but have heard mixed reviews if we should go during that time. The Louvre (to see a few items), Eiffel Tower, Notre Dame, Arc de Triumphe, and a Shakespere Bookstore are on the list of must dos. We are not big shoppers, and not fancy eaters, but could use some advice on those as well.
HELP!