I have been to a few, but non that really stand out.
Last year went to one in Qld a big one, and was very very disappointed.
In fact! I was disgusted, would be more of a truthful comment.
It was not clean, no shade, very few seats...we had to rough it.
Paid a LOT of money for the family to get in, for the day.
Not impressed at all.
There is a new Wet-n-Wild just opened in a place near Blacktown, in Sydney.
It is suppose to be huge, and amazing.
I hear that by 12 p.m. each day, the car park is Full? So maybe even that one has not enough parking space.
I also heard that people pay a lot for the half yearly ticket, and they can't go because of the lack of parking.
Haven't been to one yet as my kids haven't been confident enough at swimming. By next summer they should be, and I'll take them to Wet N Wild. I'd try Jamberoo, but it's too far to drive down for one day for me, so I'd rather combine it with a weekend away.