Good-time angler Gustavo Arenas is not your grandpa's fly-fishing guide – his trips on the Río Maullín, Río Peulo and Río Petrohué come with a dash of rock and roll and (maybe) a shot of Jägermeister.

He is building Puelo Lodge, an eight-room haven for nature lovers in the Puelo River Basin on Lago Tagua-Tagua, set to open by 2019.