Hi

We went last summer and had a great day out
Thought it was good value for around £12.00 each (less for under 8's I think)

We booked through Oracle Tours which actually worked out a little cheaper than paying at the door.
The minibus from the park came and picked us up at the arranged time and you just go outside afterwards and tell them where you want to go back too.

Food and drink is a little pricey inside but not extortionate - they won't let you bring your own food and drink in.

HTH

John