On my recent cruise on Carnival Liberty I was in room 1004. This room is forward on deck 10. It does not have a balcony but a large expanse of deck is there Late at night a noise woke me up and peeked out my window. Oh My!!
I quickly closed the curtain and went back to bed. I would not recommend this activity in a seemingly empty place. The ship is covered from bow to stern in security surveillance. If you should decide to take advantage of a quiet spot, smile for the camera.