Parque Nacional Nahuel Huapi is located near the city of Bariloche, Argentina.  It is a remarkable national park of towering peaks and massive lakes.  It is located in the northern part of Patagonia, more the Lakes District than Patagonia, but the people in Bariloche say it is part of Patagonia.  Backpackers and adventure junkies mix with 5 star "gringos" in a region whose sole purpose is to cater for the tourist.