How old are the children?
We went last week and had a great afternoon there. There were a bunch of 3/4 year olds and a couple of 11 year olds. Both seemed to enjoy it.
There was a quiz thing to fill in - easy ones for the littlies and harder ones for the older ones, with a small prize. There's a small area with playhouses which they enjoyed playing in and we could sit near to watch and drink tea and eat cakes.
What I liked was that you could see them almost wherever they were, so they had the freedom to run about.