This is a nice road running through the sandy ridge. But it is also worth to drive from Crynicka Morska forward to the small village Piaski and stay a night there. Piaski is probably one of the most quiet place in EU!
My fav. route on this side of Polish Coast. Going through, you can visit first Nazi Concentration Camp in Poland (Stutthof) in Sztutowo. It ends in Krynica, because there is nothing special after this city, only border with Russia.