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@essilenna, for poles even, it is not expensive. I don't know where are you from, but catching cheap flights to Gdansk airport is easy. Sightseeing is quite cheap, even with visiting museums. For me, there was a rule of 8 US dollars - this was the cost of ride on smaller version of London eye, eating a meal in most restaurants. You can visit museums at about 4 US dollars mostly. You can see Westerplatte using 1 dollar ticket or go to Sopot for also 1 dollar, which is part of this tricity, to see and walk on Sopot's Molo which is also great. I personally spent about 160 US dollars including flat and train from my town both sides 315km at one direction. Notice one thing we were only 3 days in this city, what is short time. If you want to plan travel here, better do it from about April, when the weather is good enough. Nowadays, Poland has strong winds and much raining.