Montevideo's main street, the Avenida 18 de Julio, runs through the heart of the city's center. You'll find everything here—shops and museums, cafés and plazas, bustling traditional markets, chrome-and-steel office towers, and places to change money. The avenue runs east from Plaza Independencia, away from the Ciudad Vieja, passing through bustling Plaza Fabini and tree-lined Plaza Cagancha.
It's a 20-minute walk from Plaza Independencia to the Palacio Municipal. If shopping is your main interest, you may want to devote an entire afternoon to browsing and buying along the avenida.