I went to some pains to make the area just in front of the viewing glass the most attractive spot to the lions! Why didn't they read the plans????
The zoo execs, or the lions?!!!

In time, I am sure the lions will gravitate downwards; in talking to the keepers, there is one female who is still very unsure about the exhibit and is only locked out for short periods of time ... when she is out, she tends to stay at the top of the exhibit, but the house. Early in the morning, both females did come down to the mid-level of the exhibit - one looked to be stalking the yellow-backed duiker next door!
As an overview, the zoo is relatively small, and is set up more-or-less zoogeographically, with exhibits ranging from brand-spanking new to very old (I think the Monkey Island is from the 1940s).
The first exhibits (waterfowl pools) reminded me of some of the Los Angeles waterfowl exhibits near the front, with rocky backdrops and 'bridge-type' overlooks. Tte front entrance is at the lowest elevation in the zoo, and the first walk is uphill passed the terraced pools. A large mesh exhibit has a pair of bald eagles, after which the visitor is out into the main part of the zoo.
The aquarium building took me very much by surprise - rather than being devoted to rows of tanks with fish, it was more thematic, illustrating three temperate aquatic regions: Michigan (with a trout stream), Patagonia (with penguins, free-flying gulls, red-headed cardinals, and ducks, as well as some large fish), and the Pacific Northwest ("kelp forest" tank, octopus, and touch pool). The entrance is along the trout stream, which you view from above water outside, then get an underwater view from inside the atrium. The floow-to-ceiling glass gave a very atypical view into an "aquarium" - not only are the fish outside and the people inside, because the glass is LARGER than the stream, it gives a sense that the fish were there first and the building added second. Very cool.
The Patagonian area was nicely done, but not overly spectacular. Underwater viewing of the penguins is provided, with the glass stopping 1.5-2 feet above the water's surface. The lighting was quite low, and rockwork predominated, giving the exhibit a bit of a plastic feel (the domed ceiling is painted as a sky with clouds). The free-flight birds did make it different.
Finally, the Pacific kelp tank was quite impressive, with the viewing window rising vertically and then curving OVER the viewing areav(like a half-tunnel). There wasn't much kelp to be seen, but the fish were quite interesting, including some sharks, a wolf eel, snappers, and several other species. The exhibit ends at a tide pool area, which has a tidal surge every few minutes (very exciting for kids), as well as a touch pool area.
Just outside the aquarium is a small peanut-shaped touchtank with stingrays, sharks, and horseshoe crabs, with a $1 fee to enter.
A wallaby walk-through exhibit is perched on a steep hill around the back of the aquarium - the area for the wallabies was pitched very steeply down towards the visitor pathway, and the animals had to hop down to the visitor path to move between the two halves of the exhibit (divided by their night quarters). Visitor fencing did give them a clear path, and several times I saw wallabies in the public area, but the exhibit seemed geared much more towards people than the animals.
The North American section contains two small, old bear grotto exhibits (similar to the San Diego Zoo's current sheep exhibits), one with two brown bears, the other with a single Dall's sheep. The wolverine exhibit was a decent size for a small mammal exhibit, and was fully enclosed with mesh and two viewing windows. More enrichment and furniture is needed though! There is also an otter exhibit, with too much rockwork, but with a decent sized pool and land area for the otters.
Mountain lions and snow leopards are held in adjacent hillside cages which are build onto a very steep series of ledges; there is very little depth to the enclosures, but lots of height. Unfortunately, since viewing is at the bottom, the cats are often hard to see as they sit in the crags at the top of the enclosures. There is some vegetation, but very little soft substrate.
From the cats, you then walk along a boardwalk, overlooking monkey island on one side (will return to that later) and the South American pampas on the other. This latter exhibit is a very long, narrow exhibit with guanaco and crested screamers (and sometimes capybara), with lots of angular rockwork forming the back wall. At the far end is a small pool. The end of the exhibit is marked with a chasm into which a waterfall pours. This separates the guanaco area from a small island with a pair of sakis. Behind and above the two exhibits is the "L"-shaped maned wolf enclosure, which has the same (ugly) rectangular rockwork and doesn't appear to be that animal-friendly (the long side of the "L" runs parallel to the guanaco exhibit). There are glass windows looking up into the wold exhibit, as well as onto the saki "island", but the steep pitch of the short leg of the "L" (at the bottom of which is the window) makes seeing the wolves virtually impossible, and is made even more difficult by the fact that they seem to prefer the long side of the exhibit.
Glass viewing (very scuffed/dirty) looks into grottoes for South American tapir (formerly lions) and Amur tiger ... the exhibits are a bit unusual in that the viewing is at ground level into the grottoes, but they are far too small, especially for the tapir, since the upper half has been hotwired off, presumably for safety.
The African area, at the farthest end of the zoo, is definitely the best outdoor exhibit region of the zoo, with chimpanzees, the new lion exhibit, and a hoofstock exhibit. The chimp exhibit is rather cookie-cutter of the newer style exhibit, with the main viewing across a moat as well as a viewing window at one end. However the vegetation is quite dense and there seem to be numerous choices available for the chimps (there is also indoor viewing to a dayroom area). After the chimps come the lions, followed by the "veldt", which is grossly misnamed. The plans are to exhibit bongo in the exhibit, but currently it holds one yellow-backed duiker and a pair of hornbills (there is a vulture hiding somewhere, and potentially guineafowl too). Viewing is across a water moat, and (in part due to the lack of pressure on the plant life) the grass is quite lush and there are several trees and shrubs. It is not a special exhibit, but it was simple and very effective. At one side (nearest to the tiger grotto) is a tiny warthog exhibit which seems very out of character with the rest of Africa. The warthogs almost appear to live in a little volcano ... the exhibit is surrounded by a dry moat, with steep craggy rocks forming the sides and lip of the exhibit. The moat is inaccessible to all but the most adventurous (crazy) warthog, with the result that the usable warthog space is about half of the exhibit footprint. In comparison to the other three exhibits, this one felt tiny and barren (I would hate to try to introduce two new animals in the exhibit).
From Africa, you head back downhill to the small mammal/tropical/reptile house, which is actually underneath the boardwalk overlooking the guanaco exhibit. There is a nicely planted (but small) outdoor Komodo dragon exhibit just before the entrance, with glass viewing on two sides. Just inside the building is a two-storey exhibit with a small group of howler monkeys, which is the largest enclosure in the building, and the only exhibit to have a skylight. You then enter a standard exhibit gallery, with box-like exhibits on either side holding black-footed cats, cockroaches, porcupines, bats, tamarins, and then reptiles of various sorts. An old exhibit, but with obvious effort by the staff to meet the needs of the animals via exhibit furnishing.
Outside the tropical hall is monkey island - one of the oldest exhibits at the zoo, and one in desperate need of renovation (apparently this is one of the next big projects). The island has two main rock "towers" connected by ropes and a few logs, joining to the tropical building at one end (presumably the spider monkeys' indoor quarters are adjacent to the howler monkey off-exhibit area). It was inhabited by 5-10 black spider monkeys.
The only other areas I have not covered are the Childrens Zoo (old, with a few grotto exhibits with parrots and a porcupine, a rocky barnyard, as well as some small aviaries with magpies) and the new frog exhibit, which has the feel of a temporary display with small tanks behind simple walls. Several TINY cages line the path which links the wallabies to the kids' zoo - half were empty, and I felt sorry for the animals housed in the others.
The zoo is obviously aware of its deficiencies and has made some excellent strides in its recent exhibits. Apart from redoing monkey island, there is talk of a new bear exhibit near the front (to replace the waterfowl pools).