San Diego Zoo is massive. I think normally a day wouldn't be enough but the day we went most of the animals were indoors or had just had babies so were not on display. We saw plenty of varieties of pig and birds though and the Pandas were well worth seeing, very cute.

For the amount of hype put into the San Diego Zoo, it wasn't that great! Could have been better but the transportation and our guide were excellent. He even popped in a movie to quench the 2 and a half hour ride.