Pros: At first glance, zoo's may look a bit cheesy and uncomfortable for a first date.  Well, assuming the weather is perfect, a trip to the zoo can be one of the best first/second/third dates you can possibly go on.  It allows a perfect mixture of communication and entertainment.  Just keep it light, and make sure it's not too cold or to hot.  Usually zoo's have on-location resteraunts so it's a perfect oppurtunity for more interaction as well.

Cons:  Some zoo's are more expensive then other, and if the weather turns you're pretty much shit out of luck.

Notes: Girls go moist over cute animals.