• There is no train to the airport or a direct bus to Sopot. You would need to get a bus and a train. Both are very cheap.
• http://www.ztm.gda.pl/rozklady/start-110.html
• right side - Port Lotniczy (airport)
• So if your plane is on time, say 10 minutes to off load, 20 minutes to get through security and get your luggage. Allow another 5 minutes to get outside you would have a 15 minute or so wait for the bus. The bus would take you to Gdansk Wrzeszcz PKP, a railway station to the west of Gdansk, it's the final stop on the bus route so its easy to know where to get off.
• After that it's a short train journey to Sopot.
• There are three stations Sopot Wyścigi, Sopot, Sopot Kamienny Potok. You will get out in Sopot Wyścigi.
• From station you will see the go-cart track. Race line hostel is right over there.
• If you plan to get a taxi only get a taxi from CITY PLUS TAXI 9686 outside at the rank. Do not take an offer from one of the people who will approach you inside the airport. It Cost something about 60-80 zł