We bought a 1 day ticket for the bus for 26 euros. It does sound a bit expensive but you get a booklet of discount vouchers for quite a lot of places in Barcelona which we found quite useful. We took the blue route to La Sagrada Familia and Parc Guell then stayed on the bus back to Placa Catalunya. We managed to get seats on the top so got a good view of the sights we passed. The busses were frequent and very simple to use and you get to see a lot of the sights in one go. Definately recommended for your trip.
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