Cruise ships are so large and full of so many people that cruises need to keep track of what’s going on at all times. There are cameras almost everywhere for this purpose, including some that are equipped with head-counting technology. Cruise lines use this info to determine peak eating times for the various dining areas, as well as to gauge the popularity of activities and the general flow of passengers around the ship. Chances are, once you set foot outside your cabin door, you’ll be on camera the rest of the day — so smile!