This lake trip takes you first across Lago Futalaufquen, then Lago Menéndez, and skirts Isla Grande ("Big Island"), offering along the way a pretty viewpoint over the hanging glacier of Cerro Torrecillas. Finally, you enter the northern arm of the lake and Puerto Sagrario. A fairly easy hike will then bring you into the heart of the "sanctuary", El Alerzal, where ancient trees, some almost 50m high, have been growing for several millenia.