I had the luck of winneng a long-weekend trip to Paris at my last job.
I can say: It is the capital of romance.
Just a couple of things you must do there:
First, Do learn at least a little French. La Grande Nation is very stubborn on their language.
Go to the
Galeries Lafayette. It looks like a classic opera, but it is a mall. Bring money to spare
Go see the famous cemetery 'Pére LaChaise'. You can't miss the grave of Jim Morisson. There is a poor Flic standing next to it who has to watch that all those goth peeople do not do things TOO foolish.
Take your friend to the inner court of the Louvre, sit there, next to the glass pyramid which Dan Brown houses the Holy Grail, and enjoy a good bottle of Rosé and some Camembert and some baguette. It's all good, nobody objects to drinking of wine in France, it's almost the opposite ^^