Hi Sautee,
I think that you will find that
Disney's Hollywood Studios has a lot of experiences that your son will enjoy. Check out
Disney Junior - Live on Stage!, a high-energy show which features many characters from Disney Junior singing and dancing, and encouraging guests to join in. Nearby, you can
Meet Disney Junior Pals such as Doc McStuffins and Jake from the Neverland Pirates in a character meet and greet. You also can consider a meal at
Hollywood & Vine. For breakfast and lunch, this restaurant offers Disney Junior Play 'n Dine, featuring the opportunity to meet and dance with Disney Junior characters.
While there are not currently attractions that feature characters from Cars, there are some other attractions that your son might enjoy at Disney's Hollywood Studios. For Pixar fun, consider a ride on
Toy Story Mania!, where you ride through interactive carnival rides. If he simply likes cars, he might enjoy a meal at the
Sci-Fi Dine-In Theater Restaurant, where you will be able to eat in cars. A word of caution, there are old science fiction movie clips that play here, and some may be intense for young children, including some that include spiders. If your son is sensitive to this kind of thing, it might be best to skip it for now.
Do let us know if you have any further questions, Sautee!