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It probably takes you right to Glazebrook Station :P

Poronui Hunting Species | Sika Deer Hunting New Zealand

I believe most people hunting the Waihopai either know someone, as it's tightly controlled by the land owners to protect from poaching (understandably), or fly in to Ferny Gair or Glazebrook etc.

The access to Lake Alexander is a $20 donation PP to cross the farmers land and park your vehicle. If I remember correctly.