From Esterri d'Àneu follow the C-28 in the direction of Port de la Bonaigua. The first village you come to is València d'Àneu. Once you pass this village, at 330 m, you must take a left turn where the village of Son del Pi is indicated (Les Planes de Son is also indicated) and when you reach Son, follow the signs to the Centre for Nature and Sustainable Development in the Pyrenees. The centre is located 1.5 km from Son.