Drift through the magnificent floating gardens of Xochimilco in a colorful 'trajinera,' a flat-bottomed boat characteristic of this unique agricultural region. Learn the history of this UNESCO World Heritage Site, first established as a pre-Columbian city on the shores of Lake Xochimilco just south of Mexico City. As you ride the decorative vessel, take in the once-enormous agrarian canal system that fed the Aztec capital. Afterward, enjoy a brief visit to the National University of Mexico, which contains an outdoor gallery of mural art and sculptures.