I don't know whose hand to shake and whom to kiss.  General rule of thumb, if they're old, I go in for the real thing.  Some 60 year old in-law from my great-aunt's side with Persian sideburns is not gonna care if I plant a couple on him.  If it's a woman I don't recognize, Borat handshake, end of story.

I'm not going to fool around with the traditional hug—I have the tendency to screw it up.  I don't want Sideburns realizing I'm kissing his ear as he's hugging me.