Does the concession stands inside accept credit or debit cards?

Some do, most don't.

If they don't they have many ATM 's available through out the park

Yes they do.

I wouldn't accept a FIRM YES on this. Realize that most of what goes on there happens inside TRAILERS LIKE FOOD TRUCKS. And without some kinda wireless system, they CANNOT take credit cards. They're certainly not wired for data. I'D bring cash, just to make certain.

Yes