A must visit
Although the Wild Animal Park is a ways away, in Escondido, it is a must visit spot if you are interested at all in animals and again, if you have children.
It is a no brainer to purchase an annual members pass if you are resident so you have the option of attending both the zoo or the wild animal park. However, if you are planning on attending the wild animal park more than once, than do consider purchasing the diamond membership which includes complimentary parking to the wild animal park.
Having said all this, the Wild Animal Park is very different from the zoo and has more open areas to explore. The train ride tour is a must although the lines can be rather long during the summer, weekends and public holidays so be warned, especially if you have young children.
It is well worth the trip because of all the animals that you get to see, uncaged, roaming relatively freely within the finite boundaries of the park.