Language / What are some Polish placename suffixes? [2]

Similar to the English -land, -ia or -y suffixes (England, Australia, Normandy) or the French -ie and -ique (Australie, Belgique) what are some Polish placename suffixes?

Life / Polish traditions and customs? I'm writing a crime novel that takes place in Poland. [10]

Are there any traditional signs of trust, allegiance, loyalty, or other things like that in Poland? Like variations of handshakes, or maybe you hug more? I know with Italians, they are much more sentimental and open about love than Western culture.

I'm writing a crime novel that takes place in Poland, and I would like to use real customs.

Life / Swimming in Kalisz [5]

What is the Prosna like? Can you swim in it? Maybe boat in it?

Also, are there private spots along the shore?