a cruise ship is not a ferry boat.

it's a floating resort hotel. w/a shopping mall, theaters, and a casino. w/multiple bars and clubs and restaurants. and swimming pools and hot tubs. and spas. and saunas. and gyms. basketball courts. boxing rings...

there's so much activity - if you're bored it's b/c you choose to be bored but not b/c there's nothing to do except stare at water. of course, if you want to stare at water you can do that.