Sagrada never did it for me, not a patch on the English or French catherdrals, unless your into concrete shutter work.
Temple De Sagrat Cor on Tibado mountain would be my recommendation.
Its got it all vernacular railway, neverending staircases , then a strange little lift operated by a monk type person who looks like St. Peter to me.
As a reward you get the best views of Barcelona from a viewing point completing unhindered by health and safety..brilliant.
Second spot is the Beach although maybe not this time of year, third Tapas in the gothic area.