The Crestasee, another beautiful lake in the Flims area, is a great alternative for those people, who dont want to spend a fortune to swim in a lake. In the Autumn and Winter months the whole area is open and free of charge. How to get there: Put Trin Mulin in your GPS. Parking spot No 5 is the closest one to the lake. From there its a 15min walk through the forest. Price: its 7chf for adults and 3chf for kids.