Calling All Kiwis And Recent Nz Visitors

In March I head for NZ on a 4 week tour from top to bottom. Unfortunately it's on 4 wheels rather than 2. I start in Auckland, the Coromandel, down via Napier and places inbetween to Wellington, then over to the South Island. I don't like large, anonymous hotels, preferring small places with character, so I've sorted most accommodation through AirBnB but I'm stuck with Wellington. So I'm asking for (sensible) suggestions on where to stay for 2 or 3 nights.
Second question and far more important, what bike related activities, venues, meetings etc should I look out for during March? I've discovered the bike (and plane) museums in Blenheim, which are on my agenda, but what else is there?

 

Well Nick's place certainly looks like one to avoid. Can't see Scorching Bay on the map but I'd like to take a look at Mrs YM's Airbnb.
I'm missing out Rotorua on this trip. I was there 25 years ago, so I'm taking a different route. Made a note of Southward car museum and the Te Papa museum is on the list. Thanks for taking the time to reply.

 

Both of those look amazing, especially Birdsong Lodge, so thanks again.

 

All of that is useful. Thanks. I've got 2 days in Auckland, 3 on the Coromandel Peninsula, 1 in Opotiki (near Whakatane) because I want to drive Highway 2 across to Napier via Gisborne. 2 nights in Napier and then down to Wellington (2 nights) and across to the S.Island.
The rest is a bit vague at the moment but Abel Tasman NP is a must and Blenheim. Got several days in Ashburton (south of Christchurch) with relatives. Queenstown, short overnight cruise on Doubtful Sound (rather than Milford). Up west coast, Greymouth, across Arthur's Pass back to Christchurch (relatives again), then home. Any other suggestions gratefully received.