If low voter turnout is the concern, make it mandatory like Australia. If you are absolutely determined to exercise your democratic right not to vote, you still can. You can either take the ballot and drop it into the box with a crudely drawn thingy on it, or you can just refuse to turn up and pay your $50 fine. But for most people where the decision not to vote is one of apathy rather than a deeply held conviction that not voting is the right thing to do for New Zealand, it will solve the problem nicely.