The park is really quite big, and you'll get a good map or where all the animals are situated, so you can take a long walk around, and cut short through the middle if you don't want to do it all at once. There is at least one cafe where you can enjoy the delights of corn soup and tako-yaki (octopus balls). I personally adore both of the above, but the cafe is not that great.
I would recommend it on a nice warm summer day though, and there's definitely lots of animals to see, particularly in the high season, so you shouldn't be disappointed.
There's also concessions for kids so you should take the whole family. The best way to get there is the train from Shinjuku. I don't remember the name of the station for the zoo but ask anyone and they'll be able to help you, provided they understand what you're asking.
July 3, 2003
From journal Tokyo in the winter