The 28-sq-mile Gwydyr Forest, planted since the 1920s with oak, beech and larch, encircles Betws-y-Coed and is scattered with the remnants of lead and zinc mine workings. Named for a more ancient forest in the same location, it's ideal for a day's walking, though it gets very muddy in wet weather. Walks Around Betws-y-Coed (£5), available from the National Park Information Centre, details several circular forest walks.

The northern section of the park is home to the Marin Trail, a challenging 15.5-mile mountain-biking loop, starting immediately southwest of Llanrwst, 3.5 miles north of Betws.