Love / Better place to meet women in Poland? Krakow or Gdansk? [5]

Hello all-
I am new to this fourm and this is my post because I plan on visiting Poland next week. I am an American guy who just graduated college in California and I am on a backpacking trip throughout Europe. I have an apartment that I can stay in Krakow for a week already booked but I have been hearing great things about Gdansk. Now I already have a girlfriend so I am not looking for like a one night stand or anything, but I find it easier to meet ladies than men and in which city do you think it would be easier to find a nice girl to show me around the city? I know Polish girls are supposed to be gorgeous (I guess I will find out) but where will they be more fun? I know Krakow is supposed to be great but I am from the beach and love the beach and I hear beaches in Gdansk are great. Which city has better nightlife this time of year? Where will I have more fun for the 1week+ i will be in Poland?