Hi there!
Sadly the Northern Tararua trip is cancelled. Sunday will be the better day.
I'll go the Kapakapanui Loop, which is close to Waikanae - so the Southern Tararuas. This day trip is a medium trip, as it goes up to 1100 m...
On Sunday I'll to Waikanae by train (9:14 from Wellington) and cycle for 30 minutes to the start of the track (a simple route, sealed, no steep hills). Back the same way.
Achim