Do you have any of the expansion packs? (Endangered Species and African Adventure). If you don't, getting canpaigns done can be very challenging.
If you do, use the good features.
It's a good idea to use the following:
Elavated paths
Sky trams
Jeep vehicle tours
Binoculars
Educators (I reccomend you have only 1 or 2, then you get more money and all of the podiums get a visit)
Use attractive animals (Bengal tigers, snow leopards, wolves, fennec foxes, all of the apes/monkeys and the bears ((including red and giant pandas))
Remeber food courts need matainace workers, trash cans, tables and loos
If a lot of guests have the same favorite animals, include those animals.
Mixed exhibits.
Use a lot of scenery objects (from the benches to the elephant fountains to the bouncy rides to the music rocks)
If you have unlocked themed objects (Jungle theme, Safari theme, Endangered Species themeand Desert theme) then try to use them a lot.
USE THE CORRECT BIOMES (even if you want a, let's say, Thompson's gazzelle/gemsbok enclosure, don't bother as the guests complain about the biome even if the animal doesn't.
Use loads of toys.
Try to use natural shelters (rock caves, raised sleeping platforms, kopjes, and leave the concrete and wooden shelters).
NEVER MIX PREDATORS. Neither with other predators, or prey.
Hope that helped. :innocent: