The sea resort is not quite big, so you can easily walk on food or rent a bike. As it is situated on the Hel Peninsula its not easy to get lost.
Various Water-Sports (inexpensive)
The night life is pretty much about the outdoor beergardens on the campgrounds, and sometimes there are big tents set up by beer sponsors in town and on the baltic-side beach.
There are a lot of campgrounds that start at the edge of town. they are on the bay side of the peninsula.
On the Hel Peninsula:
On the Vistuale Peninsula: