You're safer following the valleys, provided you keep a few hundred feet below any cloud you see, as well as a few hundred feet above the terrain,
Errr.... no, you are most definitely NOT safer doing this
What you describe here is the route to perdition of several pilots every year - ducking under a cloud base, getting further and further into a valley. Until there is no more space to turn. The result is usually contained in an AAIB report
