If you are planning to travel to Barcelona, maybe you should consider a trip in the Port Vell Cable Car from the Montjuïc mountain down to the harbour. It will give you spectacular views of the harbour and the beach. Take the Metro to Paral-lel station where you hop on the cable train up to the top of Montjuïc mountain.
The cable car takes you from Miramar station halfway down the hill of Montjuïc down to Barceloneta. It’s a lovely ride that is highly recommended.