Hello Karen! Welcome to the Disney Parks Moms Panel.
It appears that the magic never stops during a Walt Disney World Resort vacation, even when it comes to receiving surprises in your Resort Hotel Room.
As far as your "card" is concerned, the acronym EWWS usually refers to
ESPN Wide World of Sports. If the card says "1-day", I would guess that the card is redeemable for
entry admission to ESPN Wide World of Sports in lieu of paying the admission cost.
If you are unsure of where the card came from, I strongly recommend that you
inquire with a Cast Member at the Front Desk of your Walt Disney World Resort Hotel to determine the validity of the card. If the card is legit, they will be able to inform you of the terms and conditions of the card and how to redeem it. If the card does not come from Walt Disney World Resort directly than be careful to verify its validity from any third party vendors.
Have a Magical Visit!
~Todd