If sand is your main stress at the beach, you can enjoy the sea with out it at the Fòrum Bathing Area, an enclosed section of the Mediterranean next to Parc del Fòrum. It's quieter than all the surrounding beaches, and access to the water is via steps that lead directly from the paved surroundings. The water itself is deep and suitable for diving, while the size of the pool, 350 meters long by 30 meters wide, allows for some serious swimming.
Ideal for people with disabilities or reduced mobility, the bathing area is equipped with a hydraulic chair, a section designed for wheelchair use and a bathing support service. Other facilities include showers, toilets and a lifeguard service, and both the Diagonal Mar shopping center and Rambla del Prim are within walking distance. The area is somewhat isolated but can be accessed by bus (H16), tram and metro (L4, Selva de Mar).
Given it is publicly owned, the Fòrum Bathing Area is free to access.