It's beautiful, and a great place to pick up souvenirs, as well as hear huge crowds of multicultural youth singing Beatles songs. On a clear day, this is a great place from which to watch the sun set. Also, a good place to view the city by night. Nearby is the Place du Tertre , where lots of artists hang out. Prices will seem high, but everyone expects to bargain.
Good deals abound.
We did not get to the Fountainbleu or Bastille , but you should probably hit them as well. There is also a Museum of Ceramics , but that is probably best left to the Ceramic Engineers and pottery wheel junkies. There was a bicycle show, too. If you are into either bikes or bikes, I highly recommend timing your visit with this. Lots of new models were there.