IndoMalaya outdoor exhibits
Great review, Zoogoer!
Here are some of my thoughts (and answers) on the first half of the exhibits you reviewed. I'll try and get to the Indo Pavilion proper soon.
I have not been in the macaque holding for some time (and never actually worked with the monkeys) ... my main impression was that the animal holding space didn't use much of the building! There are three indoor areas for the exhibit group, and then another set of enclosures for the off-exhibit group (there is an off-exhibit outdoor mesh yard behind and to the right of the main exhibit). I find the outdoor exhibit a bit unusual, in that half of it is covered (almost "indoors"), while the other half is fully exposed to the elements via the mesh. It does allow for the macaques to be outside all year round, though.
The rhino house always feels big and a bit cavernous to me, although the Mandarin ducks do help fill it out. Having natural substrate (like in the pygmy hippo exhibits in Africa) would probably be good for the rhinos, but the smell would be even stronger!

I think the current trend is to increase the variety of surfaces available, and there is now some soft flooring in the holding stalls in the back. Having plants grow inside is almost impossible when you have heavy animals like rhinos walking around ... it is hard enough to get grass to establish in the outdoor exhibits! I would like to see the garden between the rhino and tapir get more attention - it kind of gets lost behind the walls instead of bursting forth. In the back, there are three large rhino stalls which run longways along the building (you can see the three doors into the pens at the back of the rhino exhibit). There are two tapir stalls, which run "into" the building, i.e., perpendicular to the rhino pens. The first one has the door leading to the outdoor exhibit. The hope is to be able to breed both the rhinos and tapirs ... we just have to wait for the rhinos to be old enough, and for Tanuck's girlfriend to arrive!
The tahr exhibit used to be fully accessible - the pathway ran all the way around the rhino exhibit. It was blocked when the new zoomobile route was established, to try and keep the public separated from the vehicles. You can still see the exhibit while riding the zoomobile - it is a large, long exhibit which is mostly a grassy hillside. A the far end of the exhibit is a fake mountain (which you can see from the TTC bus loop).
Malayan Woods is my favourite pavilion as well - it is the only fully immersion indoor exhibit at the zoo, and as a result it feels very different from the other buildings. There is a young jumbo gourami in the "welcome" tank, but he is not white and thus blends in a bit more (his name - I think it's a him - is "Glen", after one of the zoo's plumbers). I like the free flight central portion of the pavilion, which usually houses roulrouls and Japanese white-eyes, as well as all of the butterflies. There have been some problems with keeping people on the path, though. I dislike the enclosed aviaries as you round the corner of the pavilion towards the butterfly table ... the viewing is minimal and there aren't any signs!
As I wrote before, the clouded leopards are sisters - they were born and handraised at the Buffalo Zoo, and came to Toronto when they were about a year old in 1994. There are actually two off-exhibit holding spaces for the leopards, one on either side of the exhibit. I haven't spent much time in there, but the holding on the left (away from the exit) does have an off-exhibit outside yard.