Hi, Catherine! This is one of those things I think people often forget when heading out on vacation. My own dad, who was a daily Mass goer at home, actually forgot on our very first trip to Walt Disney World to figure out a plan for Sunday Mass.
If you are going to be at Walt Disney World on Christmas Day or Easter Sunday, in years past,
Disney's Contemporary Resort has offered a Catholic Mass in the ballroom for both of those days. At any other time of the year, there is an absolutely gorgeous Church just about 3 miles away from Walt Disney World property. The Basilica of the National Shrine of Mary Queen of the Universe offers a Saturday vigil Mass as well as four Sunday Masses. You can easily get a taxi or an Uber from your resort over to the Shrine.
I also recommend stopping by the
Lobby Concierge at your resort. They may have information about other Catholic churches in the area, or maybe make recommendations about travel times.
If you do end up going to Mary Queen of the Universe, I can't recommend enough that you go a little early or plan to stay a bit past Mass. The grounds are beautiful, there is a museum of Christian art, and they have a Mother and Child outdoor chapel that is so peaceful. They also have a Rosary garden that offers a tranquil opportunity to pray and reflect.
I hope you have a wonderful vacation, Catherine!