We have cruised but not with children, have our first cruise with DD this August.

Not really child related but take a power board - that is my biggest tip for cruising. There is usually one little power point in the room and you have 50 things to plug in - power board saves the juggle. Thermo coffee cups are good too so you can fill and go :-)

I'm pretty sure there is no babysitting on board but kids club runs late, which could work if you're open to the idea.