The BBC has published a great on-line resource detailing 39 coastal walks around the UK; in conjunction with their new series on BBC2. The site includes numerous features, including audio guide notes via mobile phones.

There are hundreds of National Trust properties on the British coast and beside maps of the BBC series walks, there is also a map showing all National Trust sites in England, Wales, Northern Ireland and National Trust for Scotland sites.
The photograph is a Cornish cliff face, on the south coast of Cornwall, near Sennen Cove.