Hi, Jamie!
How excited are you that Disney Cruise Line is sailing from your own backyard next year? I'm thrilled that you're taking advantage of this fantastic
new itinerary on the Disney Magic!
Because the itinerary is new and Costa Maya isn't introduced to guests until next spring, the Port Adventures probably haven't been confirmed yet with the tour operators. Keep checking back to the
Port Adventures Page on DisneyCruise.com for updates and how to book.
As far as comparing
Cozumel and Grand Cayman Port Adventures, there are going to be several similarities as Western Caribbean port cities. However, the main difference to me is the history of the Mayan ruins available in Cozumel as opposed to Grand Cayman. Therefore, I would focus on surf and sea on the island and experience the culture of Mexico in the other ports.
I hope this helps you plan. Have a wonderful day and a magical vacation. Bon voyage!
Andi