I'd pick one area of the world- Tropical Africa or Tropical America- and house exclusively those animals.
If Africa: Focus on Nigeria. Combine the hyena, tapir, and bird exhibits between the building and Giraffe Entrance to make one outdoor gorilla exhibit. Indoors, combine the tapir and anteater exhibits to become part of an expanded gorilla exhibit. Combine the pygmy hippo with the capybara exhibit to make a larger pygmy hippo exhibit. Mix the hippos with mandrills, but maintain a dedicated mandrill exhibit where they can go to get away from the hippos. Add dedicated exhibits for dwarf crocodiles and yellow-backed duikers. Keep the saddle-billed storks in a dedicated exhibit. Free flying birds can be rose-ringed parakeets, grey parrots, Senegal parrots, cattle egrets, African pygmy geese, fulvous whistling ducks, common pochards, and palm nut vulture. Have a nice-sized pond exhibit where they can get away from other animals.
If Tropical America: Focus on Panama and call the whole complex Panama Peril. Combine the hyena, tapir, and bird exhibits between the building and Giraffe Entrance to make an exhibit for Baird's tapirs. Also, have an exhibit for American flamingos (I know they're not from Panama) to greet visitors coming in from the Giraffe Entrance. Indoors, maintain dedicated exhibits for tapirs, ocelots, black handed spider monkeys, American crocodile, and Panamanian golden frogs. Have free flying birds such as cattle egrets, roseate spoonbills, king vulture, keel-billed toucan, great green macaws, boat-billed herons, and sunbittern.