If you dream about taking a cruise, pay attention to the condition of the sea. Is it calm or is a storm brewing? This will provide you with some insight around your situation in waking life.
A tranquil sea voyage that is moving in the right direction can mean that you are looking forward to being successful at a task.
A boat that is drifting aimlessly in your dream can imply that you feel that your life lacks direction. If the boat capsizes, you may be expecting to encounter obstacles or danger in your immediate future.
Freud might have viewed the sea as a symbol of the mother and the womb, and therefore might have interpreted a dream about a cruise as representing a repressed desire for incest.
He would have considered a ship to be a phallic symbol. Jung would have thought that a voyage by sea represents an exploration of the unconscious.