Santiago, Chile - met a girl from my hometown randomly on the street. Very westernized city. It's like NYC's latin love child. Being on central time made it such an easy adjustment. Practice up on your Spanish though!
Mate. 'Mate, also known as chimarrão or cimarrón, is a traditional South American infused drink, particularly in Argentina, Uruguay, Paraguay, southern states of Brazil, south of Chile, and the Bolivian Chaco. It is prepared from steeping dried leaves of yerba mate in hot water.' http://www.lonelyplanet.com/argentina