I've never done a back to back and would like to know from those who have, do you have to get off the ship in between cruises?  Like with luggage and all like you are disembarking?  Would we have to even vacate our stateroom if we were in the same stateroom on both voyages?  I would love to know what the process looks like.  By the way, if it matters, this would be a cruise from SF to Vancouver and then Vancouver to Seattle.