Polish countryside

Hi guys. I love the countryside around Brandenburg, former East Germany. Its just all meadows & simplicity, no big spectacles, just peaceful. I assume it is just as lovely once you pass over border into West Poland? Can anyone recommend an itinery for Poland in this respect, that doesn't include the mountains to south, 'cos I know they're beautiful. Can anyone recommend lovely not so well known places to visit in Poland? I love the people, Poles are so friendly & natural. Thanks!