At what age are you comfortable with letting your kids roam the ship by themselves? I am probably overprotective, but it makes me nervous for my DD12 to walk around by herself or stay in the room alone. I am sure I am being ridiculous. I know I'd feel better if she had a friend with her or a sibling closer to her age. I looked into bringing her friend, but we can't afford to pay for it so I did not want to invite her and have the friend pay...seems rude.