I have nightmares about my son falling overboard right before a cruise (we get balconies too). Id love to leave the door open at night while were sailing, but am too afraid to do so. Hes only 2, so laying down the law wont work. We keep the door locked unless we are out there (thankfully he hasnt figured out the lock yet). The only time hes allowed out there is when we are with him. We move the furniture as far away as possible too, and sit in it. With older kids, Id tell them up front the dangers involved. You know your own kids. If theyre risk takers, I wouldnt allow them out there without you.