The zoo is right there on site you cannot miss it. You have to go over to the golf course if you are wanting to see the lions and the tigers. Usually they have a new tiger cub and it is located up by the golf course check in.
They had some birds like peacocks too and ostriches
They also had some monkeys.
All this info is a few years old and my son remembers it he was about 10 when we went and he enjoyed it.
I think a 4 1/2 year old would like it. They also took the birds and some of the other animals out for walks.
(Not the big cats though)
El Pescatore restaurant which is not too far from the zoo is excellent .