If you are in Lille on a Sunday, the must see place is the Wazemmes Market. It is a sprawling open-air market, filled with locals and tourists alike. You can buy everything from antiques, clothing, junk, flowers and fruit & veg. You can buy live chickens and freshly roasted chickens. It is a lively place for a wander, and a great way to spend a Sunday morning in Lille, as not much else in the city is open.
Address: Place de la Nouvelle Aventure, Lille
Opening hours: Sun, Tue & Thu 07-14.