If my guidebook, “The Little Book of Tourists in Iceland,” were to be believed, Iceland is positively deadly. Walk on a glacier and you could fall in a crevasse; frolic on the beach and the waves will pull you in and under; hitch a ride on an ice floe and wave bye-bye; dip a toe into a boiling mud pit and you will be airlifted to the nearest hospital, which won’t be near at all. And then there’s what can happen to your rental car: Blowing sand will strip off the paint, volcanic rocks will smash your windows, and the wind will unleash the doors from their hinges. You can’t say we weren’t warned.