Switzerland has more than 4,000 lakes, many hidden in the mountains, where hikers can rest on a wild-swimming barbecue. It takes an hour or so to get there, after an hour and a half of driving from Geneva. The altitude is not high, only about 1700 meters, and it will be a bit icy in cold winter. The lake is full of salmon, but there is no basic fishing, and there are several young people swimming in the wild. Swiss people mostly have vacation cabins on the mountain, living in the mountain, a good place to take a day trip.