I'm thinking of doing the full race this year for the first time, having only previously done the half version. I went for a reccie of the Carneddau section a few weeks ago and was unsure which was the best route to take from the top of the Aber Falls. Should I cross the river straight after arriving at the top of the falls and work my way up towards the Berras or is it better to follow the river for a while and cross further up?