Player cards in Vegas

[BREWMANCHU]

Hey, got a question.

Going back to Vegas this weekend. Last time I was there I picked up some player's cards and racked up hours at MGM and Harrahs resorts, each one at $1/hour for food.

How do you cash these in? Can you go to an MGM restaurant and give the card to the waitress, or does it have to be set up beforehand?

Thanks