After you make your Path Content, Chose Direct Select Tool (A) and click on the path that you want it to be appeared and Pick the stroke (Color) and (weight) you need. You will have the path and its content appeared as you can export it to PDF and it will be visible.
In order to make this easily reversible, you can put all your layers into a new top layer.
Then target that new layer (click on the circle symbol in the layers panel)
Then open the appearance panel
Create a new stroke (via the panel menu or the button in the bottom of then panel)
Give that stroke the desired color and stroke width.