C.K.
My daughter LOVED Kennywood at 2. (She actually first loved Idlewild at 1, which I think is a great park for little ones.)
You can go to the Kennywood website and see what he can ride, based on his height. Last year, McKenna was able to ride the Turtles, the Kangaroo, go in Noah's Ark, Garfield's Haunted House and of course, all of KiddieLand and the Merry-Go-Round. We also rode the train, which I generally don't recommend anymore because some brain wave thought it was a good idea to change it from a fun ride to an educational one about Pittsburgh's history. BORING!
The first time we went, I took a half day off to go, thinking that we would be there maybe 3-4 hours. We got there at 2 and closed the park! The only negative was that she wanted to ride things she wasn't tall enough for yet. We are very excited to go again this year!
If you have any specific questions, feel free to email me.
HTH,
Kali