Just curious as my kids are tweens now... at what age do others let their kids explore/travel around the ship on their own? My twins are 11 and I remember on their last cruise, at age 9, Adventure Ocean would have allowed them to self-sign-out and while we did not approve that at the time, they were annoyed at us because most of the kids were allowed to self-sign-out. Now that they are 11 I'm a little more open to it, but still a little wary (this would be on one of the larger Royal Caribbean ships). At what age have you let your children wander around a large ship on their own? What parameters did you set? Did your kids have a phone/wifi? Thanks for sharing your experience!