If I just go for a stroll with my dog on no preset route, how do I track my walk, simplest way to do it. Fenix 5 plus

Simply start a Walk or Hike activity and off you go. 

Sorry I wasn't very clear, I'm looking for an easy way to have my walk showing on the map and a redline showing my route. I've done it once but lately don't seem able to do it again.

Should add I want to see my route showing on watch face, many thanks

I just tested it myself. Just starting a walk and switching to the map the red line is drawn as I walk with no preplanned route. This was just walking around my back garden. Make sure the zoom scale is appropriate to show something. 

Actually, this is with my 6X. I assume the 5+ can do the same. 

Similar but yours is not showing a street type map showing local area. 

That's because it is zoomed into my back garden. You can see a street in the top left edge of the display. If I zoomed out or panned the map you would see streets shown. 

Ok thanks, how do you get to that if I press walk, do I then go to options or what? Your help is much appreciated. 

Brilliant, thanks, just what I needed to know, cheers