Thanks everyone, it was a great trip and very beautiful, as is all of this area.
There were just the two of us in our "group", but the beach was very popular, people walking on it ahead of us and behind. The people in the shots you see, except me, are all strangers. I saw lots of families with little kids, carrying them sometimes, babies and little walkers. That would have shortened my trip for sure. The soft sand and loose cobbles were tough walking in spots.
Regarding beach logs--it's true they can be dangerous, even these. There are similar signs at the trailhead about the danger of logs in the surf. None of these logs were close to the surf, not by a long shot. I respect the power of water, it was moving water that put these logs where they are after all. But these logs were over here and the water was over there. Here are a couple shots with some explanation.
Tight crop. The arrow indicates where I was standing. It's a ways down the beach from me in this shot. The figures just to the left of the arrow are about where the log is. They're also useful for indicating scale. As you keep looking further to the left, you can see the extent of the waves as the beach slopes downward to the water. There's even a young person playing in the water, also useful for scale. Please note, this is taken at high tide. The bottom of the log at the end nearest the water is about 6 to 10 feet above the surface of the water. It would have to be a tsunami to wet this log at this time, much less move it.
Attachment 40376
Wide shot from which the tight crop was taken. It give another perspective of how far this log is from the water. It also give a good view of the steepness of the beach in this area. I should note this is when I was on the log, not the next morning when the tide was out (next shot).
Attachment 40377
Kind of the same shot, next day, different hour, low(er) tide. The water is low and the logs are far from the water.
Attachment 40378
I appreciate your concern Lamplighter, thank you. There was no danger in this shot from water moving this log. Falling off, sure. But doesn't really qualify as a "beach log" under these conditions.