The best itinerary for Paris

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Guys (and girls) what would be the best itinerary for Paris, for a 4 days satay in the french capital? I have a couple of free airplane tickets that I got from travelling and would like to go to Paris with my significant-other, so what would you suggest as a good itinerary, we like to visit places, museums, art galleries, but also go to famous places, malls, etc, not picky here. Oh, and this might be in the beginning of October! thanks for your help