If I had mine zoo, in wich I would keep chimpanzees, or I would love to keep also bornean orangutan(s), I would keep them in multi-parts enclosures planted with a lot of trees, high grass, and one enclosure with pool. Every two days, the apes will be in different enclosures, and every time there will be a new novel thing(s) in the enclosure. I plan for example four enclosures each 225.0 square metres (15x15 metres), for about three male chimps or small chimp family. Enclosures will be planted with fig trees, olive trees, willow trees, and some ever-green broadleave non-toxic trees as many seen in cities. There will be true forest floor made of bark, leaves, small plants, sand, grass. I will put and hang fruits (food) on the trees, so the apes could spent a time while searching them. I will use strange smells for them (eg. leopard hairs), will grow high grass, and plus there will be tunels from the enclosures, to around periphery of the zoo, so the apes could investigate the filed pretty faraway from their enclosures. I will ,,shower'' them in hot days, if they like that. I will try to cope with the social groupings as in the wild (particular for bornean orangutans), if possible. I would give them also sweatened powdered cocoa boiled in water (I must research whether the cocoa may be toxic for apes, as it is for cats, dogs), as the cocoa is excelent antioxidant, rich also in magnesium, copper, and manganese, good for hair coat, and plant product from tropical regions, among other foods as part of their diet.
Zoos can only exist from the money humans pay them to see the captive, suffering animals. So the only way for you to help these poor creatures is to avoid any zoo....
). The only difference between zoos and sanctuaries is that in zoos people can see the animals. And the money that guests pay to visit the zoo helps to keep the animals.