Here's a summary of my first visit last Monday (22nd July 2019), from a European perspective (although I have visited several US collections).
Asia Trail
This is where we started our visit, there were signs saying the sloth bear was off show due to veterinary reasons (unspecified) which was a shame but I thought the enclosure was huge and really well done. We got to the clouded leopard enclosure just in time to see one of them get up and switch napping spots, which since it was a very hot and humid day I thought this would probably be as active as he/she'd get all day. The fishing cat enclosure was one of my favourites in the zoo, beautifully designed and good viewing, with the cat snoozing on show in one of the boxes. Finally we saw the pandas, beautiful, naturalistic outdoor enclosures and although the indoor enclosures weren't up to the same standard, considering the only indoor panda enclosures I've seen before were at Edinburgh (they're often described as looking like men's public bathrooms) they were quite nice, and all three bears could be easily seen and were moving around and eating in full view of quite large crowds already (this was at 9am).
Cheetah Conservation Station
I'll be honest, I rushed round this section a little bit, I was ever so slightly pushed for time and wanted to spend it at exhibits with animals I hadn't seen before. I really enjoyed seeing the ground hornbills and even when they're just sleeping maned wolfs are always very exciting to see (I can only think of a couple of zoos in the UK that have them). I'd never seen a vulture enclosure that was not enclosed and it was cool seeing them mixed in with the Dama Gazelles.
Elephant Trails
Didn't spend too much time here, but got a great view of the very impressive bull elephant coming out of the Asia Trail and the females were grazing down the other end of the exhibit. Good sized enclosure for a city zoo.
Amazonia
This was the one of the exhibits that I was most looking forward to and I can't quite put my finger on it but I was left feeling ever so slightly disappointed, I don't think there was anything wrong with it at all but I think I'd put unrealistically high expectations on it. The Arapaima are amazing and I'd never seen an Electric Eel before which I really enjoyed. Most of the area seemed to be a bunch of relatively uninspiring tanks scattered throughout the room and the walk through rain-forest, whilst nicely planted, seemed to not have a huge number of animal species.
American Trail
The Sea lion pup (and mum) were off-show today which was a shame but I did really like the mix with the pelicans and having three pinnipeds in one collection is really nice. The wolves were nowhere to be seen but I didn't expect them to be considering the weather. There was a really active otter swimming around and a sleeping beaver, a volunteer said that they'd recently had pups and if you're very lucky you can see them swimming in the morning or late afternoon out of the heat of the day (I wasn't lucky).
Small Mammal House
I went into this exhibit fully expecting to hate it from pictures I'd seen and comments I'd read, and, on the whole, I was pleasantly surprised. There were some really bad exhibits (Fennec Fox and Sand Cat) and some okay exhibits (Black-footed ferrets, which I didn't hate that much, one of the individuals was quite active going in and out of the burrows and this was one of my highlights of the day, I've wanted to see this species for longer than I can remember). The Meerkat enclosure was a weird one, on the one hand it was one of the most densely set up enclosures I've seen for Meerkats, but it was also the smallest and I've never seen them just kept as a pair before. I was really disappointed that the bird house was closed (until 2020?!) but seeing the Red-billed Hornbill and the Aracari went some way towards making up for that.
Great Ape House and Think Tank
Both really nice exhibits, it must be amazing seeing the orangutans going around the park on the high wires (do they use these much?) I've seen it done to a smaller extent at Dublin but this was incredible, they went on forever! I liked the orangutans controlling the mister, a really clever addition and the potential for an amazing encounter for both the visitor and the orangutan.
I like seeing the Allen's Swamp Monkey but couldn't for the life of me find the Schmidt's Red-tailed Monkey, are they still in the collection? Couldn't see any signs for them and the map was pretty useless, also couldn't find anyone to ask.
Reptiles
Amazing for someone as interested in crocadilians as I am, I was so excited to see Gharials, Cubans, American and Chinese Alligators and Tomistomas. A surprisingly large and diverse collection in all other aspects too, some enclosures looked better than others but on the whole a really nice reptile house.
Great Cats
Another exhibit that I was sceptical about but in person I was pleasantly surprised with it. Both tiger enclosures had as big a pools as I've ever seen for big cats, however I think maybe for the lions, this space would be better used if it was (at least partially) filled in to increase the land space as these aren't the biggest enclosures in the world so I would make the most of it where I could. Some more natural climbing with logs or some non-natural some wooden platforms/climbing frames (as the enclosures aren't natural looking at all so I don't see any problems with adding) to increase the space without having to expand the enclosures, which due to the design would probably be difficult.
On the whole, a really nice zoo, lots of ABC species but plenty of others that I've never seen/rarely seen before. Unbelievable that a zoo of this size and quality is free to enter, I'm very jealous of any locals! I purchased both the visitor guide and the panda guide which were both nice and informative, the guide is a little small for $5 but you can't really complain when you don't get charged entry. The map was pretty useless when looking for specific, non-ABC species, although the signage around the zoo was very good to overcome this. Will be back to see the renovated birdhouse!