How much cash for Gdynia?

[emory2001]

I'm reading mixed on whether you need cash in Poland. It sounds like "bigger" restaurants "probably" take credit cards, and "smaller" restaurants and kiosks "may" only take cash. Family of 4 spending 1 day in Gdynia, probably just lunch at a pierogi place, snacks/treats, and walking around the town. Should I get equivalent of $50, $100, or $200 USD in Zloty? 

[cruisetek]

We're bringing $100 worth for three of us. We expect we'll be able to use card in some places, and plan to do that when possible. Whatever cash is remaining will be spent on something before we return to port (food or souvenirs - it's not a great deal of cash so don't expect it will be difficult).