One of my favorite genres to listen to in my travels are westerns. They have enough adventure to keep me awake, but generally not too stressful. You know the outcome. Zane Grey, Max Brand, Louis L'Amour - these are the mainstays.
I am just finishing up the strangest one I have ever listened to. Here's the background: Successful middleweight boxer suddenly develops a heart condition in the middle of a fight. Realizing he can no longer exert himself for long periods, he plays poker, takes up a revolver and heads West.
He has all kinds of adventures, but must escape from pursuers by walking (no running), must take a nap in the middle of a conflict after hitting his foe, and generally walks around unscathed despite the handicap.
It is just the strangest Western I have ever read - but there are only so many plots, right?
Oremus pro invicem!