I think this is doable, assuming you have a good energy level. You might consider a hop-on-hop-off bus for a day to see places where you don't need to spend a lot of time (Arc de Triomphe, Pantheon, Place des Vosges, Champs, Place de la Concorde, St. Sulpice). Notre Dame, Ste. Chappelle, and Concergerie are close together on the Ile de la Cite. The Louvre is worth at least a whole day, best to get there when it opens and you'll have to be ive. You've got the Eiffel Tower covered already. Note which sights are closed which days and time your visits accordingly. I've only been outside the Moulin Rouge and I'm not sure what the appeal is. Rue Cler is nice but there are many pedestrian market streets like it (Rue Mouffetard, Rue Daguerre, Rue Levis, others), so you could pick any of them based on convenience or where you're staying. You might find the Catacombs a stretch, though they are pretty amazing. Long lines and off-center location could eat up more time than you want to use in a short trip. Use a map to group these places so you don't backtrack too much, take advantage of the HOHO bus to see the street scenes between sites, and walk in neighborhoods near the sights you'll be seeing (Marais for Place des Vosges, Latin Quarter and Luxembourg Gardens for Pantheon, Ile de la Cite, etc.) You might also consider an evening boat ride on the Seine to see things lit up. I haven't done this but people on this board recommend the evening cruise (but not necessarily the dinner that sometimes accompanies at higher cost). Save some time to sit in cafes and watch the people go by (your feet and bladders will thank you). Save time and $ by having bread-and-cheese picnic lunches in beautiful parks. And assume you will return. Edit -- Just saw Ed's plan above, makes much sense, as he always does.