The Reserva Ecologica (or "Costanera Sur Ecological Reserve") is one of those places that allows you to forget you're in a city for a while. A peaceful place to while away a few hours; caught up in nature and your own thoughts.
Looking out over the Rio del Plata, the reserva is somwhere to take a few deeps breaths and ponder over your days in the city. Many people also run round the reserve as it's so spacious (and without the usual cracked pavements out on the streets).
There are three entrances so if you're meeting someone there then make sure it's clear which one!
We-Tu: 08:00-18:00