Hi Corey,
Yes, your son is too young to do Disney Dolphins in Depth (minimum age 13 years old) or Epcot DiveQuest (minimum age 10 years old); however, I do have some options for you that I think your son will enjoy.
I was recently able to experience the
Wild Africa Trek at Disney's Animal Kingdom. Since it seems like you are looking for more in-depth experiences with animals, I think this would be perfect for you and your son. On the Wild Africa Trek, you wear special gear so that you can get closer to the animals than you can on Kilimanjaro Safaris. Experienced guides will lead you on an amazing tour through the savanna. You even get to cross a bridge above hippopotamuses and crocodiles! You get a special ride-through the safari area in a vehicle that will stop so that you can learn about the animals and watch them through binoculars. You even get to have a private picnic on a shelter built on the savanna. I highly recommend this experience. The minimum age is 8 years old, and your son must be 48 inches tall.
Another experience that your son might enjoy is the
Behind the Seeds Tour at Epcot. This is a shorter experience than Wild Africa Trek. On the Behind the Seeds Tour, you get to see behind the scenes at the Land pavilion at Epcot. My 8-year-old daughter really enjoyed this experience. She was even able to release ladybugs in one of the greenhouses (ladybug experience subject to availability). There is no minimum age requirement listed for the Behind the Seeds Tour; however, it does focus mainly on plants, so be sure that this is something that your son is interested in.
I hope that this gives you a couple of ideas for your trip, Corey! Have a great time planning, and please do not hesitate to ask if you have any further questions.