Kettle's Yard beyond any doubt - click on this link and find out about it, though the website doesn't do it justice: "Kettle's Yard was founded by H.S. 'Jim' Ede as a place where visitors would 'find a home and a welcome, a refuge of peace and order, of the visual arts and of music.'". It's an amazing litle place - and only just up the road from a good pub and a good secondhand bookshop and an escellent Oxfam.

And among other stuff, there's some lovely examples of "naive art" by Cornish fisherman Alfred Wallis, with his letters about them.