My tip is to visit the quirkiest little bar ever. It's attached to the waxwork museum on La Ramblas and is called Bosque les fades.
It's decorated like a fairy grotto, trees, a haunted castle, stars and candles everywhere (it even has its own waterfall). Ok, you may be thinking tacky but to me it was truly enchanting. And if that doesn't tempt you it has sangria on tap!
Is this your business?