Fryent Country Park, Roe Green Park, The Hive (home of Barnet F.C.). Canons Park, London Loop across Stanmore Common and Oxhey Woods, Grand Union Towpath, Cassiobury Park to Vicarage Road (home of Watford F.C.), River Colne, to finish with a Watford Wetherspoons
You can use the interactive controls to zoom in and out and to move around the map, or click on a marker for more info. (interactive map help)