The name Guindy National Park.is very misleading. Once upon a time this park was a zoo, but now it is uncared and unkempt, since the zoo has moved to a better and bigger place. There are a few enclosures and a snake park. An aquarium, nothing to boast about.
Visitors will definitely be disappointed. Tuesday is a weekly holiday and so are government holidays. Not worth visiting unless you have nothing else to do.