It's interesting to see how European zoo enthusiasts react to this thread vs. North Americans. I would love to see a plains zebra or lowland tapir! And I'm so tired of seeing grevy's… they are everywhere and so mean!
I also pass by the ring-tailed lemurs and meerkats. Many of the apes too, probably because I feel very uncomfortable when I'm around them. Elephants, giraffes, lions, and Amur leopards are way too common for me to spend too much time watching them.
I have also never enjoyed any NA animals in zoos. They are very boring to me. Mountain lions, grizzlies, white-tailed deer, pronghorn, wolves, bobcat… etc are sadly an annoyance when I walk around zoos. But unusually, I spend a great deal of time at Cheyenne's beaver and skunk exhibit.
I also have an issue when zoos put commonly kept reptiles on exhibit like corn snakes or bearded dragons.