The phrase "unforgettable cruise" means a trip or vacation on a ship that is so amazing and memorable that you will never forget the experience. Full definition
Are you looking to experience unforgettable cruise holidays in Vietnam? (barefoot-traveller.com)
Though she is not large by Indonesian liveaboard standards, she combines the modern with the traditional to create unforgettable cruises throughout the Komodo Islands. (DiveAdventuresAsia.com)