One day
Arrive (by ferry from Buenos Aires or from Montevideo) and spend the day in the Barrio Histórico — the cobbled Calle de los Suspiros, the lighthouse (climb it), the Portón de Campo gate, the Plaza Mayor and its little museums, and the vintage cars. Have a long asado or chivito lunch with a Tannat, potter the leafy squares and antique shops in the afternoon, and end on the riverfront ramblas for the famous Río de la Plata sunset.