Mentioned by Ciao Bambino!
10 Fun Things to Do in San Diego with Kids | Kid-Friendly San Diego
"Spread across 100 acres, the San Diego Zoo is home to 3,700 rare and endangered animals, with some 700,000 plants creating the lush habitats surrounding them. Well known for its animal care and conservation efforts (the zoo employs 300 animal care staff!), the zoo is a top priority for most San Diego-bound travelers. Given its sprawling size, it can be a lot of ground to cover, especially for little legs."