The best place we ate as was the Mythos Restaurant in Islands, though this shuts at 7 pm.
We enjoyed the food at the Rainforest Cafe and if you buy a dessert with sparklers, think it is called the volcano, all the servers come out clapping to your table and surround it. I think they sing Happy Birthday to you. I dont know if this may be too much for your child, depends how extrovert he is, mine would have hated it. However, the atmosphere is really good and if you have never ate there I am sure he would like it. It has moving animals, rainstorms, lightening and thunder which makes it quite a unique place to eat.