Agreeing with Lorsin
lots to see & do within walking distance. If you are interested in Gaudi, then apart from the Sagrada Familiar, there are the apartments (La Pedrera and the Casa Battlo) which are worth seeing, both outside and in, there is the Park Guell which is a wonderful park full of bizarre architecture.
There is the footbsall stadium & museum, if you are into sport. It is quite amazing and better than many national stadiums around the world.
The watefront is a great place to spend the evneing if the weather is kind to you.
I am sure whatever you plan to do, you will have a great time,
Enjoy & happy voyages,
Alan & Katrina
Last: Cruise Maritime Magellan Nov 2016
Next: P&O Oceana December 2016
Then: NCL Jade August 2017
Then: P&O Ventura December 2017
Golden, Grand(2), Caribbean, Royal, Sea(4+1 aborted)
Adonia(4+2), Arcadia, Artemis(2), Aurora(5), Azura(2), Britannia, Oceana(3), Oriana(12), Ventura(2), Victoria(5)
QM2(2), QE2(9), QV(7), QE, Caronia(2),
Oceania Nautica, Minerva, Minerva II, Fred.Olsen(8), NCL Jade, =X= Eclipse, HAL Ryndam, Aza.Journey, CMV Magellan