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An hour and a half after Paso del Viento you arrive at an old camp at Coirón. The place is deserted, devoid of natural attractions and is very close to Serón, making it a bad choice for camping. There is a small stream. Ten minutes later, we reach the stream that comes from the waterfall visible upslope. The trails then continues along the hillside, past a marshy area on the right. You can now see more clearly Los Perros Glacier. Dickson Glacier is also visible under the Daudet and Cubo mountains, one of the many drains of the east side of the Southern Ice Field, . A flat stretch follows, with some minor hills. Near the lake, you can see the unusual view from the north of Torres del Paine, and mount Oggioni (1,697 m.) to the left.

This area is marked with stakes, at whose sides there are numerous traces of the twentieth century ​​fires made to clear grasslands for livestock. About two hours after Coirón you reach the foot of a hill, where there is an abandoned building in a marshy area. Only half an hour later you arrive to Dickson.

===Day 4: Los Perros - Paso John Gardner - Guardas===

This is the hardest day. From Los Perros continue down the path across the river by the footbridge. Then turn left, heading towards the Pass. The trail has been marked in the trees for some stretch. Then cross a swampy area (it's the only part of the whole trek where gaiters would de helpful) that will last for the next hour. There are some open areas with good views.

After an hour and a half, at 760m, the trails approaches the Paso river, Cross guided by the orange markings on a narrower section. It is important to get this place right, because it is not easy to cross at other points. The path continues climbing on the other side of the river, leaving behind the swampy area. Now it is usually windy, and the terrain rocky, with the orange markings on the rocks. From several hundred meters below the pass, it becomes likely to find snow even in the summer months. If there is rain forecasted for the park, it is likely that here it will snow.

John Gardner pass is at 1200 m., 1 ½ hours beyond the river crossing. It allowes to cross the massif of the Cordillera del Paine to the western sector of the park. The views of the Southern Ice Fields and Grey Glacier are spectacular, so, coupled with the possibility of snowfall described, it is strongly suggested to do it only with good weather. There are orange rods that serve to guide the way when the weather worsens the visibility. The descent follows a moraine, always with stunning view. The retreat of the glacier can be appreciated: the former nunatak is now a peninsula, and has recently appeared a second nunatak. After 15 minutes of descent, at 950m. the first glimpses of vegetation appear, with some ''lengas'' dwarfed and bent by the wind. As you walk through the forest, the glacier is visible through the branches. The descent is steep and demanding.