Longest wooden pier in Europe
Whenever we wanted to leaver earlier classes, weather was nice and it is not summer (way too many people) we used to go to the pier. During good weather you can see Hel (peninsula), have a boat trip there or just relax with some drinks.
At the moment there are couple of restaurants and smaller shops so you can always eat something.
Unless you want to pay for entering the pier you should visit in the evening in summer or at any other season. Staying there in winter (just like any sitting in the beach in the winter in Poland) is something unforgettable :).
