For an idea of the area and its potential you can't go far wrong with : http://www.bbc.co.uk/devon/in_pictures/your_devon/
Nice thing is they are all labelled where they are taken.

For inspiration just look at your favourite landscape photographer - OK it might not be Devon he is showing you, but be assured Devon and Cornwall has it all there ready to be photographed.

A personal favourite is the walk from Lynton to Watersmeet , along side the River Lyn - loads of photo opportunities and lunch at the NT cafe at Watersmeet House.  Valley of the rocks is nearby too as is Exmoor and the associated coast line .

And every one said, 'If we only live,
We too will go to sea in a Sieve,---
To the hills of the Chankly Bore!'
Far and few, far and few, Are the lands where the Jumblies live;
Their heads are green, and their hands are blue, And they went to sea in a Sieve.

Edward Lear
http://www.nonsenselit.org/Lear/ns/jumblies.html