By car: near the Lloret Institute-School in Fenals it is easy to find parking. If you come early it is free, nearby there is one public car park with 300 places. You then have to walk some 200 m through a pleasant pine forest and you will find is just in front of you.
By bus: in summer, buses leave Barcelona (Estació del Nord) heading to Lloret every 30 minutes. They go directly to Fenals. The journey lasts some 55 minutes and when you get off, you only need to walk six minutes towards the beach. Further information HERE.
By train: if you live in the Maresme, the best idea is to use RENFE Cercanías. Trains to Blanes leave every 30 minutes, and from here, you can catch a bus to Lloret, which you get off in Fenals and you are just six minutes from the beach.