Hello Simo.
As from the latest map is obvious, that you will bump in to Russian border - Kaliningrad is on your route between Lithuania and Poland. Fix that if you do not intend to visit Russia. Besides there is a lot of military movement lately going on there.
South of Poland is nice, pretty roads along the Kaliningrad border. Near Ketrzyn there was a Hitler's command base in WWII, it's called "Wolfs Lair".
STUTTHOF concentration camp is on your way to Krynica Morska peninsula, but Krynica Morska itself is not an object to put on your list.
Up above Gdansk there is a long dune seaside (they say it biggest in Europe), place Leba (Lebsko lake).
I live in Vilnius, Lithuania, if there will be a demand of accomodation contact me at gmail : aidasass@gmail.com
Best wishes
aidas
|