This view shows both the east and west compound areas. The rainbow colored area is in the west compound. I understand that the stadium that was built after the US military's withdrawal, has been mostly unused in recent years.
This very slick eBook has some nice illustrations of the sites. Be aware that it takes a while to load and you have to click in the upper right-hand corner to turn each page.
*** UPDATE ***
Kent also sent a link to this promotional video for the exposition. Looks like it's going to be quite a place. It's hard to believe that much of this ground was once the east and west Headquarters Support Activity compounds, populated by American military folks.