Travel from Poland to Sweden & Denmark?
There is a ferry that goes straight to Copenhagen: http://www.polferries.pl/se/aktualnosci It also served Ronne (island of Bornholm, Denmark) and Ystad (Sweden). You can take ferry and bus from Ronne via Ystad to Copenhagen; it’s the quickest and cheapest way if Bornholm is to be included in the itinerary. If you want a city break, go straight to Copenhagen with the ferry. If you want a peaceful and idyllic setting, go to (or via) Bornholm. The ferry cruise docks at Nordhavn in Copenhagen, making sightseeing very easy–either walking to the center, bus 26 which stops near the ferry dock, or frequent S-trains from Nordhavn station which can be seen from the ferry dock.