For a natural experience of a different kind, plan an excursion to the steaming pools of Thermal Baths of Caldes dEstrac. This place is renowned for its mineral-rich thermal waters.
When you've finished up at this naturally heated water source in Caldes d'Estrac, why not make your way to Sant Pol de Mar Beach, Platja de Sant Simó, and Lluís Domènech i Montaner House-Museum? They're not very far from Thermal Baths of Caldes d'Estrac and also popular with travelers.