Take the entrance to Victoria and take the international road towards the Cordillera.
From the South:
You enter into Lautaro city and go towards Curacautín.
From Argentina:
Cross the Pino Hachado border crossing and take the international roadway (Camino Internacional) towards Curacautín.
In your next visit:
Do not forget considering distances and time you need to arrive to Bosque Nativo. Especially in summertime, when the traffic flow is higher and roadway repairs are common.