Hi Kevin!
Congratulations on your first trip to the happiest place on Earth! You will see the most amazing Christmas decorations everywhere at the Walt Disney World Resort and your 3 year old is going to have an awesome time. There are many attractions and a lot of entertainment that's just perfect for your son's age. You can't miss Peter Pan's Flight, The Many Adventures of Winnie the Pooh, Toy Story Mania and Playhouse Disney-Live on Stage.
At 3 years old, he's going to love meeting his favorite characters! Pick up a Times Guide as soon as you arrive at each theme park so you can find out which characters are going to be greeting guests throughout the day, their location and their schedule.
Another experience your little boy would definitely enjoy is a character dining experience. Click
HERE to see all of the fabulous dining experiences available at the Walt Disney World Resort. Chef Mickey's and Crystal Palace are great choices.
I hope this helps and thank you for visiting the Disney Moms Panel.
Have a magical first trip!