cash

How do you manage your kids' spending money? I have 12 year old and 10 year old. Both kids have multiple Disney giftcards and cash (saved from birthdays/Christmas/etc....). Is it best to combine all of the money onto one gift card? Or is it better to bring one giftcard or a small amount of cash...

Can we use cash , if yes is it exact change only? or is it cards only?