Exploring Nz 16-29th Jan, whitewater sup ideas

Hi guys I am a whitewater sup from Australia who is heading over with my board, have built my trip into a cruise so starting from southern side Dunedin and working my way up the coast. I'd love to do a few day trips to whitewater sup but have no idea on where to sus out, I would love to hear from those who can suggest da runs, I'm experienced uptown level 4 so keen to sus out all options, I start dunedian,akaRoa ,Wellington,Napier,Tauranga,Auckland,bay of islands...
any help appreciated