The Avon Cycleway is an 85-mile loop around the old county of Avon, circumnavigating Bristol without ever getting too close to it. It largely follows country lanes, some of which can be busy (particularly around Bristol Airport). The southern section is the hilliest, too. Highlights include Clevedon Lane, a gorgeous single-track road in the shadow of the M5; the viaduct crossing the Avon gorge; the market town of Thornbury; and the delightful, verdant Chew Valley. Greatly prized by local cyclists, it's not a route for first-timers but one which the more experienced rider will enjoy.