Paris is a shit hole now. Just do one day and go to Eiffel tower, look at it, dont bother going up, then Notre Dame, worth going in and free, then Louvre, mabe shopping on champs Elysee. I would say restaurants are cheap for what you get, but beers and everything else expensive with the taxes. One alternative to Paris is to go to Champagne country which is about an hour away in Reims. Or go to Nice and have an extra two days.