Transportation: to harbours
The ferries to Tallinn and St. Petersburg leave from the West Harbour. The West Harbour is easily reached by the trams 9 and 7.
The ferry to Stockholm leaves from the Olympic terminal. The tram 2 or 3 will take you there conveniently. The Viking Line ferry company uses the Katajanokka terminal and its ferries to Tallinn and Stockholm operate from there. Katajanokka terminal can be reached by tram 4.