Llyn Trawsfynydd is a large reservoir set among rolling hills, with plenty of space for water-based activities. It's popular for fishing, kayaking, paddleboarding, and boating. Around the shoreline, there's a network of walking and cycling trails, including a scenic loop that circles the lake. Launching is possible from a few points, though some areas are private, so check signage before entering the water. With both open stretches and quieter corners, it's a versatile spot for a day outdoors.