To go to the other parts of the zoo tour such as the Tiger Safari or Savannah, one needs to bring his vehicle. Of course, not all are willing to bring his car and risk it, although very little possibility, to be scratched by animals along the way.
One has an option to ride the train-like vehicles of the zoo for only P50 per person. The advantage of this is you save up on gas. The disadvantage is the road is very dusty. I do not recommend it to those who have asthma.
I suddenly remembered this site http://www.blackheadextractors.org that I browsed last week. It was so dusty my face felt like it was so thick and heavy with oil and dirt. We ran out of wet wipes for trying to keep ourselves fresh once in a while.