Welcome aboard, Crystal. It sounds like you're considering a magical cruise with Disney Cruise Line.
Unfortunately, Disney Cruise Line does not offer a cruise such as what you are describing. With Disney, you'll cruise from your port of origin back to your same port of origin, such as Port Canaveral or Miami. Disney's repositioning cruises like the Panama Canal cruise or Transatlantic cruises do begin in one port and end in another.
However, there are some wonderful Western Caribbean itineraries on the Fantasy, Magic and Wonder that will be making port stops in Cozumel next year, Crystal. Keep in mind that Disney offers amazing
Port Adventures in Cozumel so that you can make the most of your time there, even if it is just for one day.
Please stop back if you have other questions, Crystal. I'm happy to help!