The most famous walk in Tijuana is the path from the border gate to Revolution Avenue -- Avenida Revolución. Michael has dubbed it "the river of pedestrians." It begins at the turnstyle gate where pedestrians leave the United States. You pass up a long passageway known officially as the "corredor turistico" alongside a long mural where something jagged and multicolored struggles to be born from ancient and modern motifs. Then, after passing the Mexican customs tables -- usually without being stopped -- you must either turn right or go straight ahead. Right takes you to the back door of Plaza Viva Tijuana, straight takes you to the Sea of Taxis and the Island of Tacos.