There is something amazing about the sense of achievement you can get from making your way across and entire country, all under your own steam. A walking or biking tour on a coast to coast route is a wonderful way to watch the landscapes change, and visit some hidden corners you would otherwise never get to see.
Wainwright's Coast to Coast walk is perhaps the most famous, and the cycle route known as the C2C across England one of the UK's most coveted routes to complete.