Yo mate. My dream route planner would be thus:
1. Choose start and end destinations with postcode, say biker friendly hotels for example!
2. Automatically plots me the most direct route, ala Google Maps
3. I then have some sort of overlay option to show wiggly routes
4. At this point I can wigglyify the whole route, or drag onto highlighted wiggly routes
5. Wiggly routes would be colour coded for awesomeness
6. The best landmarks and biker specific locations (cafes etc) would be shown clearly for me to divert to
7. Perhaps some cool treasure hunt style tiles would be highly visible on the map too!
8. Petrol stations and road side cafes also highly visible for planning stops.
As Brettus has said, a DB would be needed to identify good roads. Some sort of easy colour coding by tone would be good for the colour blind. So perhaps normal roads in white (roads without a rating), then good wiggly roads in yellow, blending to a dark red for the best roads, based on rating.
- Users will be able to click on a road and be invited to write a review and rate it, or read reviews and see ratings.
- Same for cafes and eateries
- Hot links from the map to the accommodation providers
Hope that helps dude.