Hi there Ronda! The Magic Kingdom is my favorite park at Walt Disney World!
First, I would start my day with breakfast at Chef Mickey's in the Contemporary Resort. For breakfast, you can usually dine with Chef Mickey, Chip, Dale and Chef Goofy. My daughter really loved this experience when she was five and my son who was just a year old had his first meeting with Mickey that morning.
When you arrive at the park there are definite rides to go on! Buzz Lightyear's Space Ranger Spin, Mickey'sPhilharMagic, Pirates of the Caribbean, It's a Small World, Dumbo the Flying Elephant, and The Jungle Cruise are perfect for your four year old. There are also many rides in Fantasyland which your child will love.
Before you pick your date, make sure to check the Magic Kingdom calendar of events to make sure that Mainstreet Electrical Parade is running when you are goin to be there! You do not want to miss that wonderful parade. Double check the times guide when you arrive so that you know what time all of the parades and shows start.
The Park is large so you may not get to do everything you want to do. The most important thing to remember is to have fun! I hope you have a Magical Time! If you have any other questions we are here to help!