This is one of two postcards that arrived while we were out of town. It is from a 16-year-old fellow in Poland.
I think this postcard must be what is considered an "ad card." In listing their likes and dislikes of the postcards they hope to receive from others, members of the postcard website often indicate that they do not want to receive "ad cards." I take it that an ad card is a free postcard which advertises a place or event.
I looked up the website printed on the postcard. It described a municipality in Poland that offers many opportunities for rest and relaxation...and recreation.