Sail & Sign Onboard Account | Carnival Cruise Line
https://help.carnival.com/app/answers/detail/a_id/1138/~/sail-%26-sign-onboard-account
WEBGuests may activate their Sail & Sign account on Carnival.com, My Cruise Manager, Online Check-in, or on the first day of the cruise at embarkation. Guests must deposit cash (USD currency only) or Traveler's Checks (USD currency only) at Guest Services on the first day of the cruise.
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