You will need a map, I suggest OL 20 Ordnance Survey and I would recommend starting at Kingsbridge where there is ample parking at grid ref 735439 and an excellent opportunity for a stopover at the excellent Creek's End at the beginning or end of the ride. A Google Earth view opens in a separate window.
Head off along the A379 following the signs to Dartmouth. The views across the estuary are staggeringly beautiful. Pass through the lovely villages of West Charlton, East Charlton, Frogmore, Chillington and Stokenham. You will then have wonderful views over Slapton Ley and the sea. Carry on through Torcross and continue along the Slapton Line until the Higher Ley. The pain begins, prepare for a long slog uphill to Strete and turn left in the village centre. Continue uphill into lovely countryside as far as Cornish Wood and Stancombe Wood.
At this point it is best not to have a snapped gear cable; the rest of our ride would have been a lot less painful. The views over the South Hams at dusk are unforgettable. Continue past Forder to Newton Cross where you will be joining the NCN2 for a short distance through Wallaton Cross as far as Cole's Cross. Fork right at Kingsbridgefork Cross and straight on at Selcombe Cross before heading right towards Bearscombe. Prepare for more pain uphill to Westerlands and then you will have earned the fabulous long drop through Kingsbridge back to The Creek's End.