First time cruiser here! I am planning a cruise for my family of 3 (includes 18 yo son), and MIGHT allow son to bring a friend. I've narrowed my choices down to Navigator of the Seas (out of Ft Lauderdale) or Carnival Destiny (out of Miami) or Carniver Imagination (also out of Miami). I like all of the
itineraries. I am a bit concerned about motion sickness, and want this to be a good first time experience for us all (so I can plan for more). What do you suggest?