I like to fence off large areas of the park to allow for many mixed animal herds and simulate ecosystems.
Kinda like going to places like Pennsylvania's Lake Tobias Wildlife park. https://www.laketobias.com/ Big Paddocks with many species big and small.
Though I like the idea of going further. If flyers are allowed later on then perhaps larger bird-like dinosaurs like Jeholornis could wander around like Peacocks or pterosaurs like Dimorphodon that according to Mark Witton may have been more like a "ground bird" pterosaur, only flying when it needed to.
And I believe in addition to this to add to the idea of simulating an ecosystem, I think if or when aquatics are added, they should be able to be added to our rivers and lakes and swamps. Could make a large Solnhofen exhibit with window'd areas to see under the water and above to see Archaeopteryx(somewhere that minis could work despite my dislike of them.) crocs, ichthyosaurs, and Compsognathus.
So flyers outside of "minis" able to free roam and aquatics able to free roam. If a species has to be in a mini, then perhaps a free roaming alternative in the form of similar species like how Para and Charono are put together. If Microraptor is too small to be free roaming then perhaps the larger Changyuraptor can free roam?
Would also like to see locomotives, monorails and older styled trains and jeep tours. Diversity and styles to best fit your parks.
And live prey... Though I have gotten backlash for this one, I will edit my response... perhaps fish, large insects, and rats could be used for smaller predators like Velociraptor and younger megatheropods.
So the ability to have land, sea, and air animals all in one exhibit, locomotives, and live prey... maybe to go with the roaming peacock idea, certain animals have no threat level and thus can wander outside of exhibits.