First, I'll probably be there for christmas and hope I'll be able to see the
surrealist photo exhibition at Beaubourg.
Second, I really like many places around Beaubourg and the center of town : Seine banks, Ile de la Cité, Marais (4e arrondissement), Quartier Latin (5e-6e with some hints like the Arenes de Lutece)... But of course, there is much much more to see!