Next time,try entering by the top of the bridge (São Bento metro station-and straight ahead), to Gaia Side and then just walk down until you reach the harbour.The view is stunning, it's like walking in a time machine. There are houses there more than 400 years old.
Try also at night, the view is unbeliveble, specially if take some frames from the top of the bridge.
Regards, and a big votefor such a wild angle.
Joao