Doesn't the water park get a good clean every year? (I suspect it's a legal requirement).
When did you last see your local council pool emptied and cleaned?
I doubt its a legal requirement.
The real evidence of TLC at the waterparks would be the snapped ropes being replaced, broken squirters working, buckets filling up etc.
There are quite a few bits and pieces in there which no longer work because and have been left broken.