As much as I'm a diehard roadie pedals for road bike type person (I'm a Look pedal user since Greg LeMond made them famous), I'd switch to a pair of my mountain bike shoes with Cook Bros pedals, probably the Candies, for riding cross country. This is because I'd spend a lot more time walking around and in weird situations - like mud in campgrounds or parks. Keos do not shed mud while Cook Bros pedals don't know the meaning of the word mud.
Frends know gud humors when dey is hear it. ~ Da Crockydiles of ZZE.