Poland's territory extends across several geographical regions, between latitudes 49° and 55° N, and longitudes 14° and 25° E.In the north-west is the Baltic seacoast, which extends from the Bay of Pomerania to the Gulf of Gdańsk. This coast is marked by several spits, coastal lakes (former bays that have been cut off from the sea), and dunes. The largely straight coastline is indented by the Szczecin Lagoon, the Bay of Puck, and the Vistula Lagoon. The centre and parts of the north lie within the North European Plain. Rising above these lowlands is a geographical region comprising the four hilly districts of moraines and moraine-dammed lakes formed during and after the Pleistocene ice age.
These lake districts are the Pomeranian Lake District, the Greater Polish Lake District, the Kashubian Lake District, and the Masurian Lake District.
The Masurian Lake District is the largest of the four and covers much of north-eastern Poland.The lake districts form part of the Baltic Ridge, a series of moraine belts along the southern shore of the Baltic Sea. Źródło: https://en.wikipedia.org/wiki/Poland#Geography
Take a trip into the higher parts of the mountains in particular when the weather conditions are conducive ago.Of course, it is not worth kidnap immediately on conquering the highest peaks, but it is worth to grade the level of difficulty of routes..