To quote Audrey Hepburn, Paris is ALWAYS a good idea. I love the Bird Market, the sidewalk cafes, and people watching at the fountains across from the Eiffel Tower. That said, the parks are amazing - Europe really knows how to make parks - and the museums are to die for. You could spend a month at the Louvre and not see it all.
I could go on and on, but the fact remains that Paris is one of the world's greatest cities.
"....and in the end, the love you take is equal to the love you make." - John Lennon