Aquatic creatures and pterosaurs, eh?
Aquatic creatures: Mosasaurus, Tylosaurus, Elasmosaurus, Nothosaurus, Icthyosaurus, Plesiosaurus, Megalodon, Platecarpus, Cryptoclidus, Liopleurodon, Archelon, Lepidotes, Onchopristis
Pterosaurs: Pteranodon, Dimorphodon, Quetzalcoatlus, Hatzegopteryx, Rhamphorynchus, Pterodaustro, Tupandactylus, Ornithocheirus
While we're at it...
Park Attractions: Gyrosphere (Like the Land Cruiser in JP:OG), Gondola Lift, Zipline, Balloon Tour, Petting Zoo, Underwater Observatory (Basically just a shark tunnel), Feeding Show
I like your ideas except the Indominus rex and Arlix (I also think there's a bit too much sauropods). I'd definately play this if it existed.