When we were on a play date at the zoo, we went into the fish and lizard area where you cannot bring strollers. This was a big mistake for me as Paul loves to run. He thinks it is hilarious to run away and have his mom chase him. I swear if I was not in decent shape or at the ripe age of 31, I would not be able to keep up with him!
Other favorites are the hippos, rhinos, lions, zebras, and geese that just walk around the grounds.