Nahuel Huapi is Argentina's oldest and most popular national park, offering just about everything for any interest or physical level. The park surrounds the city of Bariloche, and its headquarters are downtown in the Civic Center. The park's main feature is the 3,500m (11,480-ft.) extinct volcano Tronador (Thunderer), named for the rumbling produced by ice falling from the mountain's peak. But the park is also known for the glacial-formed Lake Nahuel Huapi and its lovely forested peninsulas and waterways that often provoke comparison to the channels of southern Patagonia or the fjords of Norway.
Best that I can come up with, George.