Come fish the East or West Dart if you want some rugged terrain and an outstanding, challenging, yet stunningly beautiful environment within which to fish.
Otherwise fish the Teign with all of the other old women
The Teign will no doubt hold some better fish for you on a one off day, but you must remember the high moorland rivers can be quite dissapointing come September; if you come prepared for a great walk then you will go home very very happy... If you catch some fish - more so
If you decide to fish the East or West Dart drop me a pm and I will give you a nudge in the right direction for some good access and egress points on the South West's best kept fishing secret
'Jurassic' Coast... Exmouth, Budleigh, Seaton??? Where abouts are you?