You can go to a bar and drink a beer if you like - Zywiec beer is good here.
You can meet natives but better learn Polish language to speak with them :-).
Be careful the sea-men can drink muuuch!
Dress Code: Rather no suits and ties.
My nightlife spot on the picture; attractions: guides and newspapers to read, SAT TV to watch, a bottle of beer if you buy in advance.
Dress Code: Maybe pyjamas if you like.