So while various government agencies decide what to do with the Grand Palais and '' Da Vinci Code '' fans are racing through the Louvre , and the art critics , ethnologists and architects ponder the pros and cons of Jean Nouvel 's recently opened Musee du Quai Branly , this might be the season to stay away from the Seine when it comes to art in Paris and find some hidden treasures discreetly tucked throughout the city .