All four parks have something for all ages to do, no matter how young or old. That's the Magic of Disney!!
Animal Kingdom has two great shows...Finding Nemo and The Lion King. My kids, ages 2,4,&8 love them. There's a parade to see. The Safari is wonderful! You get to see wild animals right before your eyes and you can get great pictures. The park closes earlier than the rest due to feeding and putting the animals to bed.
EPCOT: If he's taller than 42 inches (I believe that is the height) and he likes fast cars, Test Track is great. When you're standing outside of the ride and you hear the cars going, it's very loud and can be a little intimidating but once you're inside...it's great! Mission Space has two separate rides, one uses the G-force-the "Orange" ride, the other is tame- the"green" this is the one my son rides-he loves it. Soarin is another great ride that you can't pass up on. The countries in EPCOT are fun and educational. Each country has a coubter service area where you can try out differen't foods/beverages. They also have either a show, movie, or ride about that country.
Disney's Hollywood Studios (formerly MGM): THere are differen't shows to watch. Lights, Motor, Action is a stunt show that is so cool. Indiana Jones is another stunt show that has audience participation. Playhouse Disney has several short exerpts from the Disney Channel TV shows such as Stanley, Tigger and Pooh, Bear in the BIg Blue House, Little Einsteins, etc. There is "The Little Mermaid" show as well.
And of course The Magic Kingdom: THere's Mickey's TOon Town that is geared for the littler kids. There's Goofy's Barnstormer roller coaster that is perfect for them. Just about every ride there is good for a 6 year old.
If you want to do a character meal there are several around the entire Disney property.
EPCOT: Garden Grill-character meal
Mexico-a nice little ambiance inside the pyramid, you could also sit outside at the counter service area and enjoy the fireworks at 9pm.
MK: Crystal Palace-character meal
Tony's-Italian
Animal Kingdom: Any of the counter services are good
Disney's Hollywood Studios: Character Meal with the Little Einsteins and JoJo and Goliath
Prime Time Cafe: You are sitting in some area of your "house" while "Mama's back there cooking and your uncle, aunt, brother or cousin is serving you dinner. It's fun! Sci Fi Diner is my son's favorite. You are sitting in a 1950's car, watching old movie clips and eating your meal.
Several other restaraunts that are in the hotels are
1. Ohana's at the Polynesian
2. Chef Mickey's at the Contemporary
3. 1900 Park Fare at the Grand Floridian
Hope this helps you. We love Disney and always hope that we can help someone else have as magical a time as we do. Someday you have to consider a Disney Cruise. My husband and I went by ourselves for our 10th wed ann and were ready to come back the next week with our children. That's been almost 2 years ago and we are still trying to plan a time with the kids!
Have Fun,
K. H.