Very bare, open enclosures 'cheap n'cheerful design' but at least they have provided plenty of climbing/swinging equipment. Sort of the exact opposite to Marwell's Siamangs who have an expensive fancy-looking enclosure but very little in it for them to swing on.
How do they keep the gibbons and monkeys from getting out or from getting into each other's enclosures? Is there a net or mesh over each of these exhibits that is not visible in the photo