Of all the waterside restaurants in this area, Peru Beach is my favorite and it’s the most popular. The restaurant is decent and the drinks are great. I recommend ordering a clericot and lounging on the grass. You can also rent a kayak or ask about windsurfing or kite surfing lessons.
To get here take the Tren de la Costa and get off at the Barrancas station, Peru Beach is just across the street here.