I always enjoyed it. The animal park itself is good - Elephants, Rhino, Lions, Wolves, Giraffe, the dreaded Monkeys etc.
The end bit includes the House 'Not that impressive and not really for dragging kids around' and quite a lot for kids. the Maze is good - a huge Yew maze that really is tricky and you can easily get lost. I think it was once the largest in the world or, at least, the UK? Then there is a large Kids playpark thing if I remember rightly. Plus, boat trips on the lake with the Sea Lions and Hippos and Gorilla Island, a model railway and other bits and bobs.
I've never been disappointed.
Have a nice time.