Ahoy, Michelle!
I'm happy to hear you've booked your first Disney Cruise!
There are lots of awesome Port Adventures available to you and your family on your Western Caribbean itinerary! The best way to see which adventures are right for you (that will accommodate all ages) is to use the search engine on Disney Cruise Line's official website. Using the filter on the left side of the page, select "Family Adventures", then narrow your selections down by clicking the "3 to 4" age range.
I suggest checking out the following adventures (My favorites!) for each port:
Cozumel:
Cozumel Beach Break Grand Cayman:
Rum Point Beach Adventure Falmouth, Jamaica:
Jewel All-Inclusive Beach Break,
Dolphin Encounter & Dunn's River Falls Castaway Cay: There are tons of fun activities happening when you visit: Character Appearances, Crab Races, Dance Parties, just to name a few! Our favorite thing to do is
rent bicycles for a ride around the gorgeous island. They supply child-sized bikes, as well as bikes with child seats on the back.
I hope you will find practically perfect Port Adventures for your family! - Diane W.