I try to follow these simple wind and hill rules on hikes and bicycling. I always like to start hikes and bicycle rides going into the wind. Most of my rides are out and backs so the walk/ride home will be downwind. It is not a perfect world so this perfect situation is not always possible but I do this for most of my bicycle rides and a few walks and hikes. The second rule is start up the hill early so that you can come back down after the turnaround. Again not always possible but I've always found a bicycle ride so much more enjoyable when home was down the hill from where I turned around.