So if you find yourself in Barcelona one of the things you have to see is surely - the beach. Barceloneta Beach is very very big with no chance of finding some shade. Along the beach goes very long promenade for walkers, bikers, skaters etc. In my country I can see what it means really crystal see but I can't tell this for Barceloneta Beach, especially during the high season. A nice one but nothing special.
Big beach with a thousands of people laying on each other, place with no shade but with lot of ''extra'' things to do. So I can advice to go there in end September or October, still warm with not so much people.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.