Cruises are confusing to me, from the outside. But like Las Vegas I'm guessing it makes sense and it's fun while you're there. These huge cruise boats are like taking a megacasino from Vegas and putting it atop a hull and sailing somewhere else. At least in Vegas, you can go to another one! :P Crazy they have their own distillery onboard, just to say they do.

There were UK and Euro power sockets in the cabin, but no shaver socket.

I've never heard of a shaver socket before. I guess it's specific to low amp GFCI breakered outlets. In the US we use regular shaped outlets with GFCI embedded.