Travel / Travelling to Poland (mostly Szczecin area) in a week! Tips and attractions? [10]

Hi guys! First post on the boards!

My girlfriend, her parents, and I, are coming to Europe in about a week to go visit the rest of her family. We'll be doing a little touring around germany, switzerland and austria, but a large amount of the trip will be spent in Szczecin where she grew up. I've been living in Perth Australia, and this will be my first trip to a non-english speaking country. I've been doing my best to learn some Polish, so I have a real rough basic understanding on the language :D

I'm looking for some tips or suggestions on what to do whilst in Szczecin and the surrounding regions (although we won't have a car, I'm not opposed to taking public transport, even for longer journeys).

I'm really mostly interested in seeing historical (especially medieval) stuff like castles and old armor/weapons - but I'm also looking forwards to visiting any national parks and gardens that are around the place (I live in Australia - i'm very excited at the prospect of green leaves and actual rivers/lakes, and in summer to boot!* :P)

I know theres meant to be a whole bunch of Viking/medieval type stuff up North, in Wolin - how hard is it to get there via public transport, and how long would you think it'd take to get there?

Outside of history/nature, I've read about a few jazz bars/lounges in the area, and that sounds alright, but in general I'm not much of a club/bar type person (though I do like to drink, and read about some Starka distillery in the area that runs tours. That sounds fun)

Any advice would be much appreciated!
-Nathan

*Ooh and mountains. We don't get many of those round my part of the world