Adults Like Going to the Zoo too

The topic of animals often come up on Bob and Marianne in the Morning. This time it wasn't dogs, it was about penguins, elephants and reptiles which led to "hey I haven't been to a zoo in forever." I always loved going to the zoo as a child.

So, why haven't I gone since I don't know when. I'm ready for a day trip so here's my request, I'd like suggestions on which zoo to visit within driving distance of New Jersey. Keep in mind there will be no children involved in this trip just adults so I don't need a kids park. Thank you in advance.