Secret benches? I took it all the way from Prairie Creek Visitor Center, through Fern Canyon, to the ocean and back. I do recall seeing at least one engraved/dedicated bench along the trail, but was unaware of any Easter eggs to look for.

That was my first time seeing the Redwoods, so I decided the highest rated trail was a good place to start and I was completely blown away wandering around amongst those stoic, majestic monoliths. Absolutely amazing.