The way points of this running / walking route:
Go past the punts to start
Route can be a bit muddy here. Also not totally clear what path to follow. But the basics are obvious
This bit is again tricky when wet. Also windy and narrow so beware of unexpected others.
The turn around point. You can of course continue on the towpath to Ely if you wish
Beware traffic for a bit
Beware traffic
You can cross the footbridge and go back to the start here or stick on the road and come back via Magdalene