After meeting your guide at the local partner's office, listen to a quick safety briefing before receiving your bike (a comfy beach cruiser) and helmet. If you choose the South Circuit, begin with a cycle around San Telmo, one of the city’s oldest neighborhoods, known for its well-preserved colonial architecture. See its many attractions, including the Russian Orthodox Holy Trinity Church, San Telmo Market and Dorrego Square, the heart of San Telmo. Observe life in the square’s cafes, bars, and shops, and watch for spontaneous tango performances – as San Telmo is the center of tango in Buenos Aires.  Next, ride into La Boca, Buenos Aires’ most colorful neighborhood, where a European atmosphere has remained strong since the neighborhood was settled by Italian immigrants. The district is popular with visitors for its brightly painted buildings, especially along the Caminito – the neighborhood’s main (pedestrianized) drag where you can see local artists selling their work.  Then, head to the newest neighborhood in the city: Puerto Madero. Its old docks have been transformed into restaurants, lofts, and offices, which boast incredible views of the city. From there, continue to the Ecological Reserve, an 865-acre nature reserve that lies between the city and the Rio de la Plata. Finally, visit Plaza de Mayo, the scene of all major political events in the country since the founding of Buenos Aires. Take a look at the Government House (Casa Rosada), the Cabildo, the Metropolitan Cathedral, and the main public buildings.  If you go for the North Circuit, start the tour in Puerto Madero, the newest neighborhood in the city. From there, ride through Recoleta, famous for its French-style buildings and large parks. See Recoleta Cemetery, where legendary Argentinians like Eva Peron (aka Evita) are buried, and pass through Barrio Norte, an informal name given to a lively section of Recoleta around Santa Fe Avenue. Then, head toward the district of Palermo – Buenos Aires’ largest neighborhood. Ride to Palermo Woods, the city’s largest park, where you can admire its rose garden with more than 400 rose bushes. See more of the park’s sights, including the Buenos Aires Zoo, the Botánical Garden, Plaza Italia, Galileo Galilei Planetarium and the Spaniard’s Monument.  Throughout your tour, your entertaining and informative guide will give facts about Buenos Aires’ rich history and provide commentary about the sites you’re passing. You’ll also rest periodically to stretch your legs and take photos, ending your tour in San Telmo.