On the spur of the moment, we decided to spend the weekend in Big Sur.
This guy scared the crap out of me as I was walking by, and we ended up waiting several minutes for him to finally decide to give up his spot in the middle of the trail. Though he didn't make any noise, I could have sworn I saw a rattle on his tail as he was slithering away, which I initially doubted due to his coloration (a bit greenish and without the stereotypical diamonds -- plus his head was a bit small). However, he does look bit like these guys, which are rattler variants from around here, so it's plausible (and I don't currently have a better theory).
Full set here.