Hiya Steve!
Talk about a fun dad! I bet your kiddos are so excited to go adventuring with you. Let's try to plan a beautiful day for all of you in
Cozumel! Booking multiple
Port Adventures is certainly possible in some ports. It depends on the timing and the travel required for each experience. Diving in a little deeper, I see that the
Cozumel Atlantis Submarine Expedition is 2.5 to 3 hours long and the
Cozumel Beach Break for Families is 4.5 to 5 hours long. Longer excursions like the beach break may only leave once per day, which would make it tough to fit in the submarine trip. I recommend deciding which activity is your priority and booking that one first, then checking your second favorite one to see if any times allow you to do both. The online booking system will only allow you to reserve both if it looks like there's enough time to get where you need to be.
I see that your itinerary also includes
Disney Castaway Cay, which is my favorite beach ever! That will be an amazing place for you and your kids to play in the sand, swim in the surf, and explore. Because everything on the island is so close together,
Disney Castaway Cay is an easy place to enjoy multiple Port Adventures. Book your favorite one first, then see what else is still available! You might want to rent a bike to roll around the island, feed a stingray, float in the ocean...or maybe you'll do it all!
Wishing you and your kiddos an adventurous and relaxing cruise, Steve!
Keep moving forward!
Amanda