There are various ways to bring qigong into your walk.
The ones I would consider simplest would be to put a smile on your face and walk with a straight spine. You can add the relaxed and open (straight finger) hand posture to recieve energy.
Next easiest would be to stay in the present moment. Don't think about things that have happened, or will happen or might happen. Open your channels mentally and join with the universe at this time, as your take the walk.
Getting a little harder, you could to Breathing of the Universal Eergy without the side-ways arm movement. Just doing the reverse breathing and the visualization of this exercise.
I've also tried to do small universe, but I find my breathing too fast while walking to really enjoy this meditation.
These are all things I've done as well as few others, and they've all made my walks more enjoyable and refreshing.
You are perfection.
Iam2 
