Well it would definatly be easier to be able to show you, like being at the zoo and actually showing ya. Anyway I'll give it a shot.
We all know of the main path leading to that part yeah? Well at the very end, where it curves down you could and another path going up through to join the path that takes you through the lemurs free-roaming area. The bottom area leads to the cafe. That way you don't have to double back and can go straight up to the lemurs. I obviously have no idea what this would do to the lemurs, by adding a new path I'm curious to know would they start exploring down there or have they already been down there and it's is of no interest?
Another one is the thin small path near the start of the main path. It leads directly to the Tapirs and winds down through loads of overhanging trees. Well
A) I'd like to see that as a walkthrough area for some sort of small, harmless monkey. Like the lemurs, except they'd be restricted.
B) Or an exhibit on the other side that "connects" somehow to the Tapir exhibit. A form of deer or antelope that can socilize with the Tapir. I know Tapirs are solitary mostly but I don't think they'd be really annoyed with it.
C) An exhibit that doesn't connect. This could be done up and widened (not sure how big it could be) and place animals such as Rhino, hippo or pygmy hippo. Or possibly a monkey or ape such as the orang-utans or a bit cat like a snow/leopard.
D) Or just clear away all the trees and place several info boards around. The easy option
I have other ideas aswell for the zoo such as the little empty exhibit between the maned wolves and lions. Are the black-footed cats going there?