If in your travels through Paris you should happen to get lost, ask directions from a person with a baguette tucked under their arm. Parisians rarely travel more than fifteen minutes from their home to get fresh bread, so that person is certain to know the neighborhood.
While out wandering the streets of Paris, if you should see a bakery with a line coiling out onto the sidewalk plant yourself firmly in it. Parisians are willing to wait in long lines only for the most exceptional bread and pastry. If they are taking the time to stop and pick some up then you, the traveler, certainly should too.