Ok, based upon your continued evolving comments and my continued ideas that might leak here are my thoughts:
-If we do get a new natural lagoon it has to be better than the one from JWE2 (and in more than one map). Not restricting land building space and lagoon fencing.
-Regular Lagoons should connect to land enclosures and we need two types of lagoons (salt and fresh water animals), that will open the doors exponentially to a lot of new behaviors as well creatures (there were a lot of freshwater species from both Mesozoic and Cenozoic periods).
-If no freshwater lagoons at least add deeper water tool.
(This one is far fetchee but I don't care) Maps should allow to visit other locations in the same vicinity: think starting a park in Sorna 93, you can go to Sorna JP3 and then Sorna from JWE1. This is restricted in the type of building you choose: if you choose JP 1993 (I wonder if they will add some facilities from JWR as part of the roster) then you cannot add a Biosyn facility. If you choose All Buildings then you can avoid that option. This also means, if the maps on thr US states return, that if you load a map in California you can seamlessly travel between: California, San Diego and NW USA as well SW USA (all in their non altered states) so long as they are in California (USA).
Making Island hopping return (mix it up with the previous idea and you can have a fantastic Campaign).
Main things for the game:
-attractions: boat/Kayak Tours (Planet Zoo has them), gondolas (Planet Zoo has them), rollercoasters (Planet Zoo has them), pools (Planet Zoo has them), paragliding, rock climbing (think different than the indoor offerings of the attraction module), gliders, the San Diego Amphitheater can have a different look depending on the biome we place it in as well adjustable signs.
-pens: different sized fencing, lagoon fencing, deep water tool, rocks from the JWE1 aviaries, costumizable aviary domes, invisible aviary domes (think JWD system).
-decorations: more skeletons for display, vending machines, ruins, waterfalls.
Maps: the new island, Guam, Azores, Kenya, China (there are a few places that can be used) the ones from JWE 1 and JWE 2 so long as they don't conflict with each other, square maps, Egypt, Colombia, Chile, etc.
-creatures: Cenozoic animals as the Megalondon was just a teaser.