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The existing "absorbent landscape" on the left shows the areas of the campus which is currently green and open spaces. Because of the building distribution and that whopping great big road that separates the two HP campuses, the new Apple campus will have far greater spaces and greenery, making this campus one of the most beautiful and environmentally friendly in the world. The permeable area of the old campus is 42.6 acres, while the new campus will have 118 acres.
You can also see the tree distribution. Apple is keen to keep the vast majority of the trees planted exactly where they are. But because it has to bulldoze some to make way for the donut-shaped building, it will plant over a thousand more. HP's campus has 4,200 while Apple wants to bump that number up to 6,000.
Apple's next-generation campus will also have to be secure to prevent protests, intruders, and aliens from landing. The campus will also have a VIP entrance area towards the west of the campus, and include restricted public access. But Apple will probably not be able to escape the fact it will need a great big fence to surround its campus to prevent public access.