Has anyone got their P.A.D.I certificate whilst on Princess, thinking of doing it on our next cruise (Dawn Princess, Southern Caribbean) didn't know how much time out of the day it took, how long were the open water dives, and just any information from someone who has actually got their certification whilst on board. Was thinking about doing the whole thing on the ship rather then part of it in England as it works out very expensive, much cheaper to do the whole thing on board any help would be great thank you.