How exciting, I remember my first time on the QM2.
Cunard purists will tell you that it is a crossing as opposed to a cruise. They have a very different feel because your time is more your own since you are not worrying about getting ashore to see whatever is ashore.
There are also a lot of daytime activities to choose from, e.g. Spa, lectures, the Planetarium, trivia quizzes, dance lessons, leisurely breakfasts and lunches, reading and a favourite with many - sitting and watching the world go by. And one of my favourites afternoon tea.
Sun Princess (2 times), Mississippi Queen, Dawn Princess, Coral Princess (2 times), Regal Princess, Grand Princess (2 times), Diamond Princess, Maasdam, QM2 (15 times)