Not too important, but this is
downtown Rakaia:
And this is the Rakaia Gorge Bridge No 1 heading upstream:
So...
Flight to Auckland (everyone bunched)
Flight to Christchurch (staggered arrivals)
Arrive at Rakaia Bridge
Sign-up for boats next morning
Boats take teams upstream to Detour Decision
Teams take ATVs to Detour of choice near Mt Hutt
Detour of racing cars or fishing
Where is the Roadblock located?
Pit Stop at Terrace Downs