The Cretaceous Trail was planned to have more dinosaurs, even interactive ones. The one planned for that area was an Acrocanthosaurus. It was designed to be an interactive AA figure where you can could push buttons and have to certain fuctions like feeding on the plants, etc. All the infrastructure is still there, but the equipment has been removed.
Here is a bit of trivia for you, that little garage next to Chester & Hester's, I think there is a ATM machine there now. It was actually the equipment room for the Acrocanthosaurus. It had a HPU, power, and control panels similar to the equipment room for the River Iguanadon behind Restaurantosaurus and the Dig Site. They were re-purposed to be 2 of the 4 HPU's used for Mission Space.