I am from the U.S. and trying to plan a 4 or 5 day bike ride in mid to lower South Island area, for this January. I have traveled by car from Nelson down the east coast through Christchurch, Dunedin back around to Queenstown. This time I was thinking a central loop from Christchurch, through Queenstown up west coast and back cutting through to Christchurch. I would have a wife riding double on Enduro bike and would prefer some back country roads for parts of the trip. Thanks for any advice.