When visiting the San Diego Zoo you can definitely...

When visiting the San Diego Zoo you can definitely spend all day there! I would definitely recommend taking the bus tour and sitting on the top deck on the driver's right hand side there are more things to see on that side. Also I recommend walking the Zoo counter clock wise so you can avoid the uphill incline near where the polar bear exhibit. They also have a souvenir cup that you can buy with free refill for the day just remembered to keep your receipt (no one asked us for our receipt).