Great skatepark to both skate and surf as the skatepark is next to one of the great northern beaches of Spain. The town has a great skate culture and local skate shop 310 skateshop.
Great articles on skatepark: http://www.confuzine.com/2015/02/18/zarautz-skatepark-basque-country/
Local skate shop: http://www.310denda.com