This cache is a 35mm film case, craftily hidden in a Log O' Wood at the start of a path that leads all the way along the Takaka River, out to sea. Well worth the walk, so park up at the provided coordinates, and lock up your car. Head under the bridge, and look for a path on the right that starts when the paddock fence finishes. The cache is soon after the start of the path. (To get all the way along the path to the sea, you may need to scramble over some rocks...)
No pen.