I did the 3 in 7 last year based in lostwithiel, some ticket info here http://www.nationalrail.co.uk/times_fares/pr0f61f9c35ce741009c0e3842403e09.aspx on day 1 I covered the newquay branch, Falmouth branch, st ives branch and penzance,
day 2 got me to looe, gunnislake and to totnes
day 3 took...