Most important: start with a 48 hours rest. Most of the light walk/jog pain disappear in 48 hours.

Please, do NOT stretch before walk/jog. To stretch cold muscles can cause bigger damage than the walk/jog itself. (You might check any walk/run web sites, they all advice against pre-walk/jog stretch.)

Instead of stretch, warm up - 5-7 min with slow walk (for example starting with 3 mile/hour, then slowly increasing the speed with .1 in every min).
If the 1 mile is walk, and not jog, a LIGHT calf stretch after the walk is enough.

How fast is the 1 mile? Are you use any incline?

If you walked every other day without problem, how about now keeping the same every other day schedule? It is easier for the leg 2 miles every other day, than 1 mile every day.

Something els: I envy you for the "secret woods". Trails are the EASIEST for the legs. Even the best treadmill is harder. Your legs might react simply to the different/ harder surface.

As an encouragement: the first weeks/months of walk/jog are always hard. It is very common to feel light pain here and there. To feel different pains in the tow legs is common too. After 8-10 weeks all these pains go away, and only the pleasure stays:-)))

Take care:
Eva