It depends on the tickets you have, but the Guided Tour, Kangaroo Express bus and the Skyfari may be included. The mini train is not included nor is the 4d theaters. The mini train is only open on weekends. There is also Giraffe Feeding on the weekends, that is an additional cost ($10 for 3 bisquets)
Corinne, the Skyfari just completed its yearly safety inspection so you should be good to go.
The Zoo is open 7 days a week from 9am to 5 pm (winter hours). The bus covers 50% of the Zoo grounds in a 30 minute guided tour. Mother express bus is more like a shuttle, with 4 stops you can get on or off at.
If you have specific questions, you can PM me. I have worked in the Guest Services Dept there for 15+ years.