Szczecin is a nice port country by the Baltic Sea. There are many hotels to choose from, for example Neptun, Boncza, Arkona, or Radisson. You don't wanna miss visiting the sea (it's sort of cold there though, but not below 0C which is good). You may also visit Gdansk and Gdynia -- I think Gdansk is the most beautiful city by the Baltic sea; it reminds me of Krakow or another "old" city. Szczecin is more industrial and port city.
I live in the south of Poland so it's too far for me to visit Szczecin area (besides, in summer it's nicer there as you can swim

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