We weren't sure if it was still alive, but we had a large plastic ziploc bag with us, so we filled the bag with seawater and gently placed the animal in the water. This is the next view we had:
The waves were fairly large this morning (~9.5 feet), so perhaps this octopus was tossed up onto the rocks and was a bit shocked by a rough landing. But once in the aquarium-like setting of the ziploc bag, its eyes opened, it started actively pumping water through its siphon, and it starting reaching around with its long arms.
Here are two close-ups of several arms and an eye.
We were glad to see that the octopus appeared to be fine!
Note the chromatophores surrounding the eye. I introduced octopus chromatophores and showed some photos and videos of them in February. If you haven't seen those yet, you can check them out here.
P.S. I'm not certain, but it's possible that the octopus in this post is a juvenile Pacific Giant Octopus (Enteroctopus dofleini).