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"Fumarolas->" sign is not anymore
[[Imagen:Paso_valle_aguas_calientes.jpg|thumb|200px|Pass to the valley of Aguas Calientes. Photo: [http://www.innovacionsocial.cl Constanza Miranda]]]
A few steps below the entrance to the public hot springs, towards the south, at the last curve before the parking lot, a path begins that ascends a forest of Coigües. At the start you will see a red and white wooden sign the signals telling "Cabalgatas a Fumarolas->T. Aguas Calientes - Cel. xxxxxxxx" (fumaroles), so it is difficult to get lost. This point is at 1.710 meters of altitude.
The path ascends through the forest on a very clear track. After some 30-40 minutes of walking, the vegetation disappears and the first fumaroles become visible. The route goes some 100 meters from them, so the detour is well worth it. Then you should keep going to the pass that leads to the mud baths. Here, [[Imagen:Vista_valle_Aguas_Calientes_desde_el_Oeste.jpg|thumb|200px|Aguas Calientes Valley as seen from the Pass. Photo: Juan Pablo Ortega]] you will see the pass for the first time, towards the east, located next to the left of a tower of rocks. At this point, you will have two options: descend to the mud baths and then ascend through the valley, or mount a few meters on the edge with direction to some second fumaroles.
If you decide for the fumaroles, once these cross, you will see a fork, which is not too visible. A path descends until reaching the valley and another follows the hillside without losing height, following a black tubbing that carries water to Termas de Chillán. Although the path that descends to the valley will make you lose height and goes back to the vegetation, it is a more comfortable trek than the traverse next to the tubbing (the waypoint "Estero", though, corresponds to the traverse route).
