I was not on cruise ship but I had opportunity to be on huge crane ship from work. I would go for a cruise just to experience calmness of the sea and looking into distance to get overwhelmed by amount of water around. Even though I live all my life close to the shore and going to the beach often, it was still totally different to be in the middle of it than just looking at it from shore. Feeling was like I would be on different planet or something.