This depends on the type of cruise and your destination. You'll probably need at least some proof of citizenship. You'll receive complete information on required documents well in advance of your departure, so you'll have plenty of time to make your arrangements.
Are there different classes of service?
Today's cruise ships are "one-class." Everyone onboard can use all of the ship's facilities. The price of a cabin is based primarily on its size and location. Regardless of the category you book, you'll enjoy the same courteous service, menus, activities, and entertainment as everyone else onboard.
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Included In Cruise
Drinks-Milk, Juice, Water
24 Hour Room Service
Onboard daytime activities,
Not Included in Cruise
Drinks beyond above
Optional shore excursions
Personal services such as massage or hairstyling.)
Fine Dining Restaurants
Some ships only have one meal for 24-hour room service then there will be a cost.