@ Ben: Summer here may mean rugby is out of season, though who knows- the cricket season and the rugby season seem to overlap more and more these days

Some things have changed since you were here - Christchurch is still pretty much stuffed following the Feb 2011 earthquake and the Cantabrians don't currently have a dedicated stadium for rugby but are making do. The House of Pain is no more either- Dunedin now has a fantastic new purpose-built roofed
stadium - brilliant for playing in glacial southern temps.
@ Faith: Another possibility for you might be Hanmer Springs, which is a lovely resort area an hour or so's drive north of Christchurch. Wouldn't like to guess at cycling distances - haven't been on a bike in 30-odd years! Hanmer has great bike/hiking trails and even better, natural hot pools to relax in after you've crippled yourself
If you're going up north and have time, Northland is astonishingly beautiful with sweeping, pretty much untouched beaches. Long may it stay that way- it would be a tragedy to ever see it become condominiumised. Like the equally spectacular East Coast where
Whale Rider was set (have you seen the movie?) it's also a very poor area, so there is a notable juxtaposition between stunning scenery and ramshackle settlements. Don't know if it is available in the US , but there is a moving little NZ film called
The Strength of Water, which captures a powerful sense of Northland Maori culture - the poverty but also the strong spiritual connection with the natural world.