Paris, Texas or Paris, France?

If you're refering to Europe, I recommend
La Bastille for it's bars and nightlife.
Check out the little side streets for some great drinking spots.
Le Marais is a nice area for sight-seeing, window-shopping and a good falafel or sushi.
Le Cimetière du Perè Lachaise is a beautiful place to visit.
Be sure to check out the grave sites of Oscar Wilde, Jim Morrison, Modigliani, Édith Piaf, etc.
It should keep you busy for at least a day.
Centre Georges Pompidou for modern art, or
Le Louvre for the masters.
Enjoy your stay in the "City of Love".