Fodor's Expert Review Reserva Ecológica
Built over a landfill, the 865-acre Ecological Reserve is home to more than 500 species of birds and a variety of flora and fauna. On weekends thousands of porteños vie for a spot on the grass, so come midweek if you want to bird-watch and sunbathe in peace or use the jogging and cycling tracks. A monthly guided "Walking under the Full Moon" tour in Spanish begins at 7:30 pm April through October and at 8:30 pm November through March. Even if you don't speak Spanish it's still a great way to get back to nature at night; otherwise avoid the area after sunset. The main entrance and visitor center is across from the traffic circle where Avenida Tristán Achával Rodríguez intersects with Avenida Elvira Rawson de Dellepiane, a short walk from the south end of Puerto Madero; you can also enter and leave the reserve at its northern end, across from the intersection of Mariquita Sánchez de Thompson and Avenida Hernán M. Giralt.