The shops are open on Sunday but don't open until around 11am on weekdays so it's best to arrive in the afternoon if you want to soak up some atmosphere. I did a walking tour of the area which you can find here. It was great, easy to follow and lasts for about 2.5 hours but if you're stopping for lunch and window shopping you could drag it out all day.
Rue des Rosiers
St.Paul-St.-Louis Church, the Church is one of the oldest examples of Jesuit architecture in Paris.