Every Sunday from October until February, at 11am, come and visit the Séquia Major, which is a wetland, in an urban environment, which preserves a sample of the vegetation and fauna of the original Mediterranean coast. It is a protected area, included in the Plan of Areas of Natural Interest (PEIN) of the Generalitat de Catalunya, since 1992.
If you want the visit in English you should book one week in advance. Booking from Monday to Friday between 9am and 2pm at Patronat de Turisme de Vila-seca (Tourist Board, in c. del Patró, 10)) or in the telephone number +34 977390362.