they are accounting for the same people in society... so it depends too much on knowing first "how vegan friendly is society", because this is what they're catering for.
Just go and have some fun ^^
But I mean if you really wanted to know, someone has to do a study of the type of people,
that go on cruises and whether they are generically voracious animal consumers.
if you found out that in comparison to a city, the majority of people on a cruise,
love animal for food.... then you'd not want to go by kitchen when they load up >_<
but by not going.. lol you'd not be helping Vegans very much,
because if you do go, the next person that asks, would get a better answer
maybe look over the planned activities and they will give you the best idea
or plan an eco trip? where you sign up to help out at some sanctuaries,
or assist a voluntary organization casually while you stay somewhere?
would be the best way to making a vacation vegan friendly
like Indonesia or Malaysian rehabilitation centers or keep an eye out on green peace site,
or look up activist holidays or something ^^
I'm sure there are eco-holidays in this day and age.
if the cruise ship parks on the great barrier reef and dumps its ballast,
it probably wouldn't be very Vegan friendly,
or spills oil into some breeding zone for sea horses :<