i haven't been to many zoos in the past but my guess is that they will not be able match that of San Diego Zoo. They have a lot of animals here. If you had to walk the entire zoo, you'd be in for a lot of walking since the zoo is so large. luckily, the fare we paid ($35 for an adult) included the bus tour guide, express buses (there are two express buses) and sky tram. We used all transportation options to traverse through the zoo. We saw the giraffes - including a baby giraffe that was born just last week, elephants, rhinos, hippos, monkeys, gorillas, jaguars, lions and tigers. All the animals you would expect to see at a zoo. They also had Meerkats on display which were super cute - much cuter in person than watching on TV( meerkat manor). and of course, they had panda bears. The pandas were very active when we went. We witnessed one climb a tree with absolutely no difficulty and then navigate through the branches - i feared that it would fall but no, it seemed most natural. the other was eating bamboo which was very cute to watch.
There is quite a bit to see here at the zoo and it appears that this zoo is very eco-friendly - their benches are made with recycled plant materials and they aim to grow as much as the food in the park for the animals as possible (as an example, they grow most or all of the bamboo used to feed the pandas).