I'd really like to see more atmospheric elements added to JP, in particular the foliage that lines the guest walkways. Dinosaur noises or even 'interactions', rustling shrubbery and more electric fences would help bring the island to life in areas that are currently nothing more than a stretch of nothing.
Right now, in between JPRA and the Discovery Centre, it's often easy to forget you're supposedly in a huge, living dinosaur exhibit.