I use google maps, basecamp and create tracks for my bike tours. I then transfer these to my etrex 20. The beauty of google maps is street view. Where available it permits viewing the roads, bike lanes and traffic patterns so you get an idea of the suitability of the route. I also use existing gpx files from crazyguyonabike and other sites to simplify. I planned the gpx route for Ireland but was able to readily find the routes for the Rhine, Mosel, Saar and Lake Constance....our next trip. The learning curve is a bit steep but works like a charm.