Water trams (basically ferries) sail during the summer season departing the quayside near the museum ships in Gdynia. In Gdynia tickets can be bought from the ticket offices in the large building next to the ferry stop. Sailings marked R are subject to demand. Be warned that tickets, especially for the first sailing of the day to Hel, are very popular and you'll need to be there at least half an hour before the tram sails most days to start queuing.
Although most taxis are now trustworthy with honest metres, there are still certain drivers who will quite happily take advantage of your ignorance and overcharge for journeys. To guard against this ensure that you use a taxi which is clearly marked. The firms listed below are all reliable and will have their company clearly marked on the taxi and their fare tariffs displayed in the window of the car. Taxis are slightly cheaper if called in advance. If calling one of the abbreviated numbers such as 19686 please be aware that you may need to prefix it with 58 if calling from your mobile.
And now a warning. Because each of the cities are independent when it comes to taxis the driver is allowed to put the meter to the higher tariff when he leaves Gdynia. That means if you are travelling from Gdynia to Sopot or Gdansk the tariff increases at the Gdynia/Sopot border. This can make a difference to the fare between Gdansk and Gdynia because the Gdansk taxi will spend more time in his own city and therefore at the lower tariff. A taxi from Gdansk to Gdynia will cost around 80zl whereas a taxi in the other direction will cost around 100zl as the Gdynia taxi will be spend more of the journey outside of its own city.