Chizlit, I'd go along with the broad discussion of Into Africa etc... but I'm surprised to hear you were disappointed with the Rainforest. It's incredibly popular and I rarely hear anything but praise and excitement from visitors. There are seven emperor tamarins and two golden-headed lion tamarins who are often almost within touching distance of visitors; there are also two titi monkeys, two sloths and four species of birds. They are all pretty easy to spot. The only animal you may not catch a glimpse of is the tamandua!
Maybe it was because I had heard how great it was and it didn't match the expectation that my mind had built up. I honestly didn't see any of those animals just a few birds, maybe the men up the ladder had scared them away. There were animals in small cages around the side of the rainforest, I've no idea if they have access to the rainforest area or somewhere outside, if they dont it was a small area to live in.