Chalk under your boots, big skies overhead, and the sea drawing steadily closer to the south — the South Downs Way is walking distilled to its essentials, on England's only fully bridleway National Trail. It's also the easiest to reach: an hour from London at one end, ninety minutes back from the other.
The South Downs Way runs 160 kilometres along the chalk escarpment from Winchester to Eastbourne, high, open, and airy, with the Weald falling away to the north. Stages are moderate — 20 km a day at Explorer pace, on well-drained chalk that runs fast and stays clean underfoot. Villages sit in the valleys either side of the ridge, so most nights end at a country pub or a proper Sussex B&B.