This is really one of my favorite places to go to Buenos Aires. The reserve has several different "trails" that are done in 45 minutes to a few hours. One person takes you to the "beach" of La Plata, where you can walk on the beach rocking and listen to the waves. Others take you to the lagoon. Every time we go, we see a lot of different birds and animals - you just have to look and listen. Also, seeing the rubble of the building is amazing. They actually just push the building into the river, so you see there are colored tiles, glass and pebbles everywhere you see. A charming and peaceful place.