The quickest way to the cache is to park at the Wreck of the Peter Iredale beach (free). Then hike/bike north on the Kestrel Dune Trail. Let your guidance gadget take you to the spot.
If you are unfamiliar with the park trails, pick up a trail guide from any ranger station or information booth.
It’s a nano but not at all what you would expect.
The log is in the vial. Bring tweezers. BYOP.
Nota Bene: If you are caching in the late spring or early summer, mosquito repellent is highly recommended. They’re wicked this time of the year.