05-27-2016, 12:08 PM
I really like the Strava Global Heatmap. It's not a routing tool, per se; instead it takes the rides people have uploaded to Strava over the previous year (which is a lot, though probably more geared toward serious riders/runners) and that plots a heatmap based on the routes that see the most travel. This typically correlates with the best biking or running routes. I use it in conjunction with plotaroute.com (which conveniently will plot out elevation charts of the given route) to plan out my rides or runs.