If I were going on a cruise, I could think of many much better use of my time than cracking APs. This just seems like you're doing cruising wrong if you're so concerned about it that this is where you want to take your experience
I'm an older dude, and no longer find talking to strangers all that fun.
I like nature and the outdoors, but that can be admired only from a great distance until you make port. Going fishing off a moving cruise ship will end your vacation rather quickly (aside from not being feasible - you're going too fast for anything which is catchable on light tackle).
I love the swimming pools and such, but my wife can't swim.
There's all kinds of gambling and stuff, but I don't gamble.
I spent much of the cruise wishing for better internet... Or that I'd brought more books.
We spent a good amount of time playing FF7 in the evenings on our hotel TV wired up to a PSP.