1) first pause the game or just close the zoo to guests
2) next in all 4 corners build one exhibit with one your 4 favorite biomes or parts of the world
3) in all of these corners make one food court and try to get a tour in 1 or 2 of them
4) next build somthing nice in the center of the map like a giant coral reef tank or a nice car tour through Africa or Asia
5) there has to be a path from the 4 corners to the center
6) the entrance has to be full of plants and fountains and maybe a lake. u also should have a small food court in the entrance
7) with all of the empty room u can make more themes
8) around all of the veiwing areas there should be plants, trees, viewing canopies, and benches
9) dont forget the workers and benches in random places for those tired guests
10) unpause and have fun
11) try to use not your favorite animals but use the most popular ones and the ones u dont use often to make it unique.
12) on a large map u should have 7-9 mixed exhibits, in a medium u should have 5-7 mixed exhibits and in a small u should have 3-5 mixed exhibits