There are few nicer places to be on a sunny day than sitting at the outdoor tables of a cafe on the quayside of the Nyhavn canal. The canal was built to connect Kongens Nytorv to the harbour, and was long a haunt for sailors and writers, including Hans Christian Andersen, who lived there for most of his life at, variously, numbers 20, 18 and 67. These days Nyhavn is a tourist magnet of brightly coloured gabled town houses, herring buffets and foaming beers.