The red-porticoed entryway to Liberdade (which means "Freedom") is south of Praça da Sé, behind the cathedral. The neighborhood is home to many first-, second-, and third-generation Nippo-Brazilians, as well as to more recent Chinese and Korean immigrants. Clustered around Avenida Liberdade are shops with everything from imported bubble gum to miniature robots and Kabuki face paint.
The best time to visit Liberdade is on Sunday during the street fair at Praça Liberdade, where Asian food, crafts, and souvenirs are sold. The fair will very likely be crowded, so keep your wits about you and do not wander around at night.