The coast from Kingswear past Coleton Fishacre is the most attractive, but it is strenuous with a lots of ups and downs. You can do it as a linear walk using the local buses, with access to Brixham, Hill Top and Kingswear, but not in between. You can also get the train from paignton to Kingswear and the bus back from Hill Top, or Brixham.
There are car parks either side of Coleton Fishacre and circular walks that include the coast of just about any length you want.
We did a circular walk from Coleton Camp on the 23rd, and the Garden is looking lovely. See our track and photos here: peter-thomson.com/south-west-coast-path/coleton-camp-kingswear-froward-point-coleton-fishacre-2018-04-23.html