Do you need swimming trunks and bathing suit?

No not really... They're not that strict about actual swim wear

I Checked, u can wear clothes in water, have to check with manager informed me about this and it's true and I seen others done before.

Yes

Sure makes sense, unless you want wet clothes.

It's an indoor water park. Swimming wear is required.

Not really cause more children you can put them on children

Yes if not you can buy there