You can reach the Tri-city by ferry from Scandinavia, on Stena Line or Polferries vessels.

From Karlskrona to Gdynia on board a Stena Line ferry. The voyage lasts approximately 10 hours and is complete with all forms of entertainment which may help you forget the seasickness.
From the harbour in Gdynia you can arrive at the city centre by public transport - bus lines no. 105, 125 and 150 or taxi service.
To find out more visit http://www.stenaline.pl/

From Nynäshamn to Gdańsk aboard a Polferries ferry. The voyage takes 18 hours and you can have fun at the ferry's bar, cinema, casino, nightclub, restaurant, etc.
You can arrive from Gdańsk terminal to the city centre by a taxi, tram (no. 15 with a change to tram no. 13) or SKM local train (6 times a day from Monday to Friday).

To find out more visit http://www.polferies.pl/