Where to go Running!! (Barcelona)

For all of you who like running; it looks like Barcelona is starting to get a bigger running-community every day! Good news if you ask me, but where to go to go for a relaxed and healthy run?
I myself only appreciate the beach and la carretera de les Aigües (as I will have my office ther from 1 april !), but where do you like to run?

Please let me know good places where you like to run, so I can maybe offer good and fun trainings there!

Hope to run into you soon,
Koen
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