Expanded maps is a must, another thing is an idea I propossed the following here after I discussed it on the Jurassic World Evolution 2 Discord server: "Places like Isla Nublar and Sorna should be one big map with different zones with which we can access using the Arrival Points ex: in my Nublar 2015 map I placed a second Arrival Point as the Monorail Station serves as the one. I renamed the Monorail Statio: "To Nublar: South (using the map from Germany)" while the second Arrival Point: "To Nublar: North (JWE1), West (Nublar 93), East (UK as a substitute)." In order to travel to the different zones just use the arrival points and after a loading screen you get to that section of the park (how JWE1 campaign worked but applied to single locations). Now to be honest, it would be most welcoming if actual Nublar East and South maps are introduced and the JWE1 maps brought back to JWE2 as then it will work.
The JP and DFW eras could use their respective Arrival Points as transition to the other places."