The road is a fantastic plod as it is mostly open with wild ponies and lots of sheep so be careful of animal droppings in the road. You will come across the Tavistock Inn just past Poundsgate, it is a fantastic little pub with an open fire and does great food. The ride is worth it just for the pub itself. You can either follow the road onto the A38 or work your way back, its upto you.
Great for a blast or great for a cruise, depends how you feel.
The ferry across from Dartmouth was Â£1.50 so have change ready also there is a motorbike garage/cafe (Dreambites & Dream Bikes, PL210SX) 3/4 of the way that appears out of nowhere, which provides everything you could need for a rest. Just beware that it really does appear out of nowhere.