CH3MTR4IL5 said..
Ruapehu? There is something pretty satisfying about the phrase 'skiing an active volcano'.
About my 3rd year snowboarding when the eruptions started, being keen I still kept going. The initial lahar flow improved one of the gullies

and after that just smelly Sulphur ash.
Done plenty days the with two commercial fields gives a choice on which is better on the day.
Ruaphau needs a lot of snow to cover rocks where as most fields 50cm covers tussok and good. August is usually best month for south island fields.
Back to watersports here's a link for kiting
web.kite-and-windsurfing-guide.com/spots/kiteboarding-windsurfing-sup/oakura-taranaki-new-zealand.htmlThe naki coast locals refer to "course black sand" other wise known as rocks

but there are a few sand beaches.
A mate Stevo is currently at the naki mainly for windsurf wavesailing and he would bring a sup but not sure if he took his foilboard?
I never bothered with Stent road but there are so many spots with surf depending on wind direction. With your ribs, maybe leave your surfboard behind