Greater London Walking Routes
http://www.gps-routes.co.uk/routes/home.nsf/county-walks/Greater%20LondonOpen linkView original on vlemmy.nethttp://www.gps-routes.co.uk/routes/home.nsf/county-walks/Greater%20LondonOpen linkView original on vlemmy.nethttp://www.gps-routes.co.uk/routes/home.nsf/county-walks/Greater%20LondonOpen linkView original on vlemmy.net
For walking I find that ramblers is a good resource. I wouldn't mind doing more walks but I have an aversion to going out by myself.