We loved Barcelona, we were only there for a long weekend but we walked so much all around the city and the outskirt. We've enjoyed very much obviously Gaudi's work. I was actually very fascinated about the story of how the architecture of the Sagrada familia was defined, all based on nature and the power of trees.
we would love to go and spend more time as there are quite of things to discover there! Enjoy your time and the weather is probably getting good and warm there.