The canals and chinampas (artificial islands) here are what’s left of an extensive system, built during pre-Hispanic times, that connected most of the settlements of the Valley of Mexico. Now a World Heritage Site, the area is worthwhile (short) detour from the city center for adventuring on a beautiful day. Ask your hotel to book you a guide for a ride in a trajinera, a colorfully decorated flat-bottom boat, along the canals. Onboard you’ll have live mariachi performances, food, and drinks. Also in town: The Dolores Olmedo Museum (Avda. México 5843; 52-55/5555-0891; museodoloresolmedo.org.mx), housed in a stone structure dating from the 16th century, has the greatest Diego Rivera collection in the city and some beautiful paintings by Frida Kahlo.