We are planning a cruise with 3 teenagers next August . Anyone who has been on Carnival Fascination (Miami, Key West, Cozumel, 4 days), or Imagination (Miami, Key West, Calica, 4 days), or Inspiration (Tampa, Grand Cayman, Cozumel, 5 days)? I heard the Sting gray city in Grand Cayman is really fun? I looked at the excursion description for Key West and it does not look like really unique. I would like to see something that you can not find on any other tropical beach, like ruins, unique formation, ..etc. Anyone has any comments? Otherwise all the other excursions seem similar ????