Walking through Llafranc. From the harbour until the stairs that go to Calella (carrer Francesc de Blanes with carrer escales de Garbí). Continue through those stairs to Camino de Ronda that takes you to Calella (20 min walking from Llafranc).
Take an icecream there, visit Calella, and come back. In the summer time it's better to do it after 18:00. In the winter, in the morning. Excellent views.