We went as a family of 7 in half term.
Firstly it was very expensive to get in, £13.50 per adult and £45 for a family of 4. Also the entrance price only includes the basic rides and you have to pay an additional fee to use the bigger rides.
WI couldn't believe how many people there were, you had to queue for ages to do anything and couldn't move in the pools!
Couldn't recommend for the price and I wouldn't return.