how much time do you have?
If you have at least a month, and youre a normal human, then you'll have no problem meeting up with dudes that are down to lurk around and explore shit. I just came back from a 10 month visit and skated way too much random shit to mention, but here's some of my favorites to point you in the right direction.
if youre in the center, definitely hit up barceloneta banks. everything in the center can be a quick bust, but they are definitely fun to hit up on the way to the beach.
beer banks at the damm factory. get off the baro viver stop and its down the river by the big factory towers.
while youre there lurk around towards the santa coloma neighborhood. fun ally way stuff, and theres those brink banks with the concrete slab on the top.
Rubi is one of the funnest spots I've ever been to. Steve Durante has a line there in Inhabitants (that one with that switch heel).
Take the commuter line towards Sabadell (S1 or S2, can't remember which one).
Sabadell has a ton of fun ledge spots too, definitely check that village out.
I just came back about a month ago, and tons of fountains were getting drained all throughout the city. So keep an eye out for those. This barca filmer Damien put a little concrete on this one pool next to Sants. last I heard it's still dry. check this ish out
http://shelterskateboarding.com/newsite/videos/nuncatravau.htmlhope that helps, hit me up if you got any more questions.