Yeah Ribbon (Garter, out here) snakes are pretty fine snakes--any snake lacking venom is pretty good in my book, actually. Of the non-venomous snakes in California, however, I've got to go with the majestic California Kingsnake.
Back in college I was walking home from class, right in the middle of Boston, and I found a pile of at least 14 of these guys all tangled up right next to the sidewalk. No idea if it was a mating thing or what.
One of my first pets was actually a garter snake I convinced my dad to order from a snake farm that bred them for dissection. She was a pretty great snake.
Poor little guy. He enjoyed a nice meal and crawled into what he thought was a cozy nest of leaves to let it digest. Then he got all bound up, it couldn't pass through and was caught up in there who knows how long fermenting.