Nightime hours are Sunday through Thursday 5-9, with a cost of members $35 and nonmembers $45 for the whole car. Fridays and Saturdays the hours are 5-11, members $40 and nonmembers $50.
We really enjoyed this, although we are zoo members and we go often. I thought that the zoo did a really good job of turning it into a drive through and using some parts of the zoo that I wouldn't have thought to drive on. I would suggest going at night, as the lights transform the animals into art!