ID Card #26 is a collectible item in Dead Island, and can be found in the Hotel of Act I. It is part of the My collectibles, let me show you them! challenge, and the Gotta find'em all and Nearly there achievements. This collectible is only accessible during the Born to be Wildquest. Once the quest is completed the elevator shaft will be closed and you will not be able to access any other Hotel area past the lobby.
Location: On the first desk in the hotel's server room. There is a tattoo shop poster above the desk. Can be seen on the following map: