We are going on our first ever disney cruise next year. My boys and I have been watching all kinds of videos to get us excited for the trip. One thing my boys are the most excited for is snorkeling on Castaway as they have never been snorkeling before, I have been snorkeling a couple times. One thing I notice on the videos people post of the snorkeling is that they all are staying at the surface. Are you not allowed to "dive down" and get closer to the items on the sea floor? I seem to recall possibly watching a video a while ago that the person (it might have been Tim Tracker), was "yelled" at by the life guards for going underwater. I haven't found any published rules online. Totally could understand why the lifeguards would want you to stay on the surface, but I wouldnt want to break an"unwritten" rule and put us in a uncomfortable situation. Obviously if the vest is inflated, this would prohibit you from diving. But most of the people I see have the vest de-flated.