Today set out for another section of trek, from Challupen gorge lagoons. Along the way pass lava rocks, evidence of volcanic eruptions, and distinctive araucaria trees, and admire the sight of Mocho Choshuenco and Puyehue volcanoes to the south. Arrive at the geometric hot springs, anciently called Cajon Negro. Designed by architect German del Sol, this striking red-wood complex features a footbridge used to visit the ravine, with thermal waters flowing underneath and abundant rainforest surrounding it.

Today set out on a strenuous uphill section of the Villarrica Traverse, one of Chile's most spectacular treks that passes beautiful forests of araucaria and lenga trees (a type of southern birch) and features dazzling views of volcanoes, including Quetrupillan, Villarrica, and Lanin. After the uphill section of the trek, walk along a path toward the scenic Laguna Azul in the southeast.

This morning leave Laguna Azul to cross a series of lava flows, taking in the slopes and the crater of Quetrupillan volcano. Climb up to the edge of the crater, along the way seeing ancient craters and panoramic views of forest-covered valleys and astounding volcanoes. Reach Laguna Avutarda in the afternoon. Also known as Laguna los Patos, Avutarda is surrounded by mountains on three sides and has lush shores and marshes where caiquen and canquen geese nest.

Depart Avutarda lagoon this morning to descend toward the Puesco valley. Walk through forests of coihue, a huge tree known as "the lord of the forest," and lenga. Take in outstanding vistas of Colmillo del Diablo volcano (Devil's Fang) and the Puesco River canyon. At the end of the trail, you'll reach the international road where a private van will transfer you back to Pucon.

Today discover Huerquehue, Chile's gorgeous national park that spans 27,500 acres and features striking mountain peaks, crystalline lakes and lagoons, and mesmerizing forests of ancient araucaria trees. Take Los Lagos, the most scenic of the park's many trails, with thick forests where you can hear the delightful sound of Patagonian woodpeckers, and a string of beautiful lakes — Tinquilco, Chico, Verde and Toro.

After breakfast, it's time to depart from Pucon. On the way to Temuco airport, take in the last views of majestic active volcanoes and bid farewell to Chile's Araucania region.