Some routes will have a GPX file available for download.
Click the 'GPX' link on the page to get the download.
Click "Save" and save the file in a suitable folder.
You can use mapmyride.com to plot and view the route by using the "import" option.
You can download "EasyGPS" to get GPX files into your GPS device or use your own
mapping software to load it to your GPS.