This is not a reply to the OP, but a general IMO!
Controlled risk is a very important part in child development. Children must be free to make choices and assess risk on their own. If they don't, cognitive development will be hindered.
There is countless theory out there that demonstrates this,from the very basic 'scaffolding approach' to the more modern 'assessment of danger' theory. Bottom line is, if you don't give children elements of freedom when growing up, their will be problems.
I have been a long time visitor of this website, and I have visited many others regarding child education (I am a teacher). The one thing that gets me more than anything is our fear of strangers and/ or paedophiles. Now, don't get me wrong we should be aware of the danger but we must assess how big a danger this is. Your child is more likely to suffer a major injury leading to death or permanent disfigurement/ injury during play than be abducted by a paedophile.
What I am trying to say is we need to balance risk. Children need to have the opportunity to make choices and be with peers - but we don't want them hanging around street corners at midnight doing this. IMO, a cruise ship is a good place to give a child freedom, perhaps test their ability to make choices.
One of the funny things we hear a lot is "the world was a much safer place when I was a child!" Erm, no it wasn't! The major difference is we hear so much more nowadays through constant media coverage, 'shock' stories and all. There are no more Paedophiles about today than when you were a child!
I think parents can become a bit blinded to the world too - and I completely understand why. Your child is the most important thing ever to you - you will do anything to protect them. What you shouldn't do is take away their childhood whilst doing it. You read so much on here about children being 'mature', 'advanced for their age' etc. I am sure if you asked every parent, at least every other would say that this is the case about their child. Almost every parent of every child I have taught, coached or looked after has said this. It is sad to say, however, that so many of these "advanced" children have so much trouble being a child....
Sorry, rant over!