Using public transport in Gdynia is the easiest, as one validated ticket is enough for the whole route of a bus. Tickets cost PLN 2. You can also buy a 24-hour ticket for 9 PLN. You should validate a standard ticket for baggage.
Discount tickets are available in each city and cost half the normal price.

The fast local train (SKM) is the quickest means of transport in theTri-city. When you buy a ticket in the ticket office you should know your destination - a friendly lady will sell you the right ticket. It has to be validated before you get on a train - ticket punchers are located on platforms or next to entrances. Trains run on the route Gdańsk - Sopot - Gdynia 24 hours a day; during the day every 5-10 minutes.