The aye-aye viewing gallery.
I'm of the opinion that the lighting at Chester is much better than that of Bristol, it's easy for one's eyes to acclimatise and much easier to see the animals. The enclosure illumination is deep red however - Bristol's is more purple - so photography isn't easy, and it's not just a case of setting white-balance.
The aye-aye's come right to the windows though, so a fast 50mm prime might be in order.
