Hi Nadine,
Thank you so much for visiting the Disney Parks Moms Panel with your question. I like your plan to spend two days at
Magic Kingdom. With the iconic Cinderella Castle, it is the theme park that many guests associate with Walt Disney World. You will find so much to do there with your little ones.
For your third day, the theme park that you choose to visit depends largely on what your children are interested in. At
Disney's Hollywood Studios, you will find opportunities to see Disney Junior characters, so if your children enjoy the Disney Junior channel, this might be the right choice. From a chance to dine while seeing these characters at
Disney Junior Play 'n' Dine, to a high-energy show combining puppets and live action in Disney Junior - Live on Stage!, there are many opportunities to see these characters.
Alternately, many children are intrigued by animals, and a visit to
Disney's Animal Kingdom will give you the opportunity to see so many in unique settings. Exotic animals such as elephants and lions are out at Kilimanjaro Safaris, and you can take your time exploring Gorilla Falls Exploration Trail and Maharajah Jungle Trek. When my daughter was young, she loved taking a ride on the Wildlife Express Train to Rafiki's Planet Watch. Here, you can see care of animals, as well as Affection Section, where children can pet animals.
Given the ages of your children, if I was making this decision, I would probably choose Disney's Animal Kingdom, but I am sure that you will have a great time at either park, Nadine. Please do let us know if you have any further questions!