Awesome thread, thanks so much for doing this for the community! Sounds like a lot of work! 
+1 to all of these on the list:
Aviaries
Exhibit Reworks
Aquariums
Full Animal Customisation in Sandbox
Turn off Hitboxes of Scenery Pieces
Rework Animal Hitboxes
Rework Base Game Animals to Current Standard
Improved Herding
Custom Map Skirts
Slower Time
Seasons
Give us all of animals from PZ1
Animal Personalities
Educational Props
Cater towards Small Animals
More Map Options
Exhibit Customisation
Animal Rankings
Egg Laying
Rework Rock Hitboxes
All Planet Zoo 1 Themes Return
Climbing Overhaul
Auto Generated Zoo News
Rework Iguanas into Habitat Animals
Nocturnal House Building Set
Random Events
Driveable Staff Vehicles
Playgrounds & Splash Pads
Variety of Animal Horns/Tusks/Antlers
Playable Keeper Mode
Animal Behaviour Overhaul
More Realistic Zoo Props
Realistic Air Conditioning Props
Animal Model Variants
Day and Night Cycle for Animals
More Fonts & Art Shapes
More Custom Signs
More Windows & Doors
Improved Interior Lighting
Realistic Transport Rides
Focus on Zoo Backstage Areas
New and Improved Enrichment Items
Big Bouncy Ball Enrichment
Improved Weather Systems
Guests will dress for the climate
Emu as a Walkthrough Animal
Add Boxless Exhibits
Dynamic Doors
Add Fossil / Taxidermy Props as Scenery Items
Add 2 & 3m paths as an offical feature
Add option to Mirror Items or Groups
Ambient Animals
Zebra on the Equine Rig
Climbing for Monitors
Don't Lock Reward Statues for Sandbox Mode
More Realistic Path Textures
Realistic Feeders
Modular Mesh Building Set
Guest Needs Rework
Improved Hard Shelter
Ambassador Animals
More Animal Guest Interactions
Improved Petting Zoo Mechanics
Optional Tunnel / Road Spawner
Adminstration Center
No Deep Diving Depth for Small Animals
Add Large Pumpkins as an Enrichment Item
Allow Barriers Directly at the Paths Edge
Add Pools
Allow the Safari Ride Track to be Invisible
Null Signs
And +1 to these:
Also:
Animal Activity Slider: Similar to the aging slider in the first game, a slider to have certain behaviors last longer or shorter, making behavior more realistic. E.g, turning the slider lower to have say, big cats sleep more rather than constantly running around. Of course, have the slider make need decay faster/slower too so my lions don’t starve themselves because they’re too busy sleeping.
Interspecies Interactions in Mixed Habitats: Could be something as simple as sniffing each other, or more complex like an elephant calf chasing guineafowl, meerkats climbing tortoises, or zebra and wildebeest herding together.
Auto Placing Seasonal Scenery: Option to create and tag sets of certain scenery items around the zoo to automatically appear and disappear around set times of year. The Sims 4 Seasons has a similar system, and I think it would make the otherwise hyper niche holiday sets from the Arctic and Twilight packs much more useful.
To add on to that: Custom Holiday/Event System: Another system from Sims 4 that would be nice in PZ2, the ability to create certain holidays (or use preexisting ones, eg. Halloween/Boo at the Zoo in American zoos, Zoo Lights, etc.). Effects could include things the player sets for a particular holiday, such as guests appearing in certain outfits, automatic paid marketing to attract more guests (such as the system from ZT Xbox), and of course, the aforementioned scenery placement.
EDIT: because I saw specific foliage being suggested, throwing in a vote for a proper NZ beech tree and a leafless baobab

+1 to all of these on the list:
Aviaries
Exhibit Reworks
Aquariums
Full Animal Customisation in Sandbox
Turn off Hitboxes of Scenery Pieces
Rework Animal Hitboxes
Rework Base Game Animals to Current Standard
Improved Herding
Custom Map Skirts
Slower Time
Seasons
Give us all of animals from PZ1
Animal Personalities
Educational Props
Cater towards Small Animals
More Map Options
Exhibit Customisation
Animal Rankings
Egg Laying
Rework Rock Hitboxes
All Planet Zoo 1 Themes Return
Climbing Overhaul
Auto Generated Zoo News
Rework Iguanas into Habitat Animals
Nocturnal House Building Set
Random Events
Driveable Staff Vehicles
Playgrounds & Splash Pads
Variety of Animal Horns/Tusks/Antlers
Playable Keeper Mode
Animal Behaviour Overhaul
More Realistic Zoo Props
Realistic Air Conditioning Props
Animal Model Variants
Day and Night Cycle for Animals
More Fonts & Art Shapes
More Custom Signs
More Windows & Doors
Improved Interior Lighting
Realistic Transport Rides
Focus on Zoo Backstage Areas
New and Improved Enrichment Items
Big Bouncy Ball Enrichment
Improved Weather Systems
Guests will dress for the climate
Emu as a Walkthrough Animal
Add Boxless Exhibits
Dynamic Doors
Add Fossil / Taxidermy Props as Scenery Items
Add 2 & 3m paths as an offical feature
Add option to Mirror Items or Groups
Ambient Animals
Zebra on the Equine Rig
Climbing for Monitors
Don't Lock Reward Statues for Sandbox Mode
More Realistic Path Textures
Realistic Feeders
Modular Mesh Building Set
Guest Needs Rework
Improved Hard Shelter
Ambassador Animals
More Animal Guest Interactions
Improved Petting Zoo Mechanics
Optional Tunnel / Road Spawner
Adminstration Center
No Deep Diving Depth for Small Animals
Add Large Pumpkins as an Enrichment Item
Allow Barriers Directly at the Paths Edge
Add Pools
Allow the Safari Ride Track to be Invisible
Null Signs
And +1 to these:
- All the new QoL features from PC2 (new paths, foliage brush, that amazing lighting system)
- Multiple habitat gates per habitat please!!
Also:
Animal Activity Slider: Similar to the aging slider in the first game, a slider to have certain behaviors last longer or shorter, making behavior more realistic. E.g, turning the slider lower to have say, big cats sleep more rather than constantly running around. Of course, have the slider make need decay faster/slower too so my lions don’t starve themselves because they’re too busy sleeping.
Interspecies Interactions in Mixed Habitats: Could be something as simple as sniffing each other, or more complex like an elephant calf chasing guineafowl, meerkats climbing tortoises, or zebra and wildebeest herding together.
Auto Placing Seasonal Scenery: Option to create and tag sets of certain scenery items around the zoo to automatically appear and disappear around set times of year. The Sims 4 Seasons has a similar system, and I think it would make the otherwise hyper niche holiday sets from the Arctic and Twilight packs much more useful.
To add on to that: Custom Holiday/Event System: Another system from Sims 4 that would be nice in PZ2, the ability to create certain holidays (or use preexisting ones, eg. Halloween/Boo at the Zoo in American zoos, Zoo Lights, etc.). Effects could include things the player sets for a particular holiday, such as guests appearing in certain outfits, automatic paid marketing to attract more guests (such as the system from ZT Xbox), and of course, the aforementioned scenery placement.
EDIT: because I saw specific foliage being suggested, throwing in a vote for a proper NZ beech tree and a leafless baobab
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