Thinking about finances this summer

It is the middle of the summer and I guess I have to get ready for a holiday! Have you already taken one? Me not...
So, the point of my thoughts now is where I should get some money for the forthcoming two weeks at the sea. No ideas yet, besides taking a credit card. This was suggested by my mom and I still can't find anything better than following her advice. Saving money doesn't help, as I can't save much due to regular expenses on numerous necessities... So I don't know whether I should take additional job or simply apply for credit card to finance my vacation. The latter seems absurd, as well as the former, though. Why can't one simply go and have fun, without paying loads of money for it? I'm ready to pay for anything but seven days of rest, because I'll have to work twice harder just to afford it.