Your destination is Benicàssim or Castellón. If you arrive at the bus station in Castellón, which is located next to the train station, you will have to take a Cercanías train to Benicàssim. You can check routes and schedules on the website of the long-distance bus companies that stop in Benicasim: Avanza or Hife. You can also use a search engine like Trainline.