SundayHikers: Santa Clause/Cow Town

After several weeks of separation, the hiking group get back together, although unfortunately several diehard members have taken ill: Handy, Giggles, and Ms. Vogue are all down. Four of us meet up at Last Command Post. Despite some foot issues, Chops gamely agrees to take the long route of ascending toward Grotto for the Santa Claus Lane.
On the way, we see two brave bikers struggling mightily up the hill, but also enjoying the beautiful crisp morning air. We notice some strange markings of silhouette shape of snake, runner, star fish and crown appear in sequence on the side of the road. We can't figure out what they mean or what purpose they have served.
With all the catching up on news and "gossip", the uphill climb goes by quickly and we are soon entering Santa Claus Lane. We are surprised to find the farm house, which always had many barking dogs, totally abandoned. Another surprise is finding the vista along the way wide open from the recent demise of the vine population. The dead vines are everywhere. We are now able to see the rock faces and the ravine, and are surprised at how high the rail track is. It is a real pleasure to be able to see deeper into the jungle.
As we near the Cow Town area, we can hear the surfs pounding on the beach, so we decide to check it out. The surfs are rough and loud. We spend some time there to enjoy the scene. Chops, Peppy and Cutie are able to hunt for their glass collection. Chops and Peppy will eventually create inlaid glass collage table tops...
The trails are pretty overgrown and slightly muddy from all the rain we have had recently. Soon we are at Bonzai Cliff and watch white caps on the ocean. The rough seas have not discouraged fishermen from cliff fishing, standing dangerously near the edge. We just hope no one falls in...

What does this symbol mean?