Plaza República Federativa del Brasil is a public square and renovated park located across the street from the Recoleta cemetery and main sites.
It is a great use of space that was preciously abandoned. There's a lot of places to sit with your mate or coffee and rest your feet. There's a great playground as well, to let your kids burn off some energy.
It's next to the entrance to the Linea H subte line and the pedestrian bridge and law school. You'll be close to a lot of great sites here so it's not a bad idea to use this park for a breather before you keep exploring Recoleta.