My son was about 2 1/2 when we took him to the T-Rex in our town (only other one in the country, I think!!). He was doing good walking up to it, then when we get inside, the large animatronic dinosaur they have in the entryway dipped his head and ROARED at my son. It was all over. My husband could barely hang on to him from there and we made a beeline out of there as fast as we could. We wound up at Cheeseburger in Paradise. Much more calm.
From what we could see on that one brief visit, it was LOUD. The music was loud, the jungle sounds were LOUD. And that was the beginning of our son hating loud sounds. A year later, he's better but it was too much for us. It will be a long time before we take DS back. Like, maybe when he's 7.
FWIW........