It depends on how long you'll stay, I guess.
BTW, Favorite places for tourists are not my favorite places at all. I can recommand you NOT to go to 'Le Louvre' on friday nights and certainly NOT wait for two hours to see the top of the Effeil tower witch has a great view but not worse it, in my opinion.
My preferences goes to the quietness of old 'Cafés' and in June and July, I'll spend all my afternoons at the 'Paris Jazz Festival' (if you like jazz, here is the program).