The Tryweryn River is best known as the home of the National White Water Centre, making it a go-to place for rafting and kayaking. The river flows strongly, so it's suited to those with experience on moving water rather than beginners. For spectators, there are riverside trails and picnic areas where you can watch paddlers tackle the rapids. It's a great location if you're after an adrenaline-filled day in a dramatic Welsh valley.