I posted this photo of the exhibit in the gallery:Does the chimpanzee exhibit provide adequate climbing opportunities? I was under the impression it didn’t, but maybe I am misremembering.
I saw nothing to indicate the chimps don't have access to the trees in the exhibit, however I don't know how often they use them either. There are some other climbing structures available, and while it isn't necessarily a lot chimps are nowhere near as arboreal as, say, orangutans.