Well, I don't hack wifi networks as part of my day job.
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.
clearly, we're all free to do whatever for our precious time off, but you just listed a whole lot of things that you don't like to do yet you paid for it anyways. again, we all like different things, but i'd prefer to spend money doing things I enjoy, but you do you