I have 2 routes. One I call my "short-cut" route. It's only 7 miles, with most of it is on a rail-to-trail called the Monon. However, it goes through the 'hood so I only like to do it in the morning. My other route is 13 miles and takes my through several parks and most of it is along a river with lightly traveled roads. It also intersects a daily group ride route and so if I want more miles I jump in and hammer with them.
I have recently rediscovered bike racing. I gave it up years ago because I didn't have time to train. Now that I commute by bike, finding time is easier. Riding through the winter has helped get me into shape and get a jump start on everyone else! Why didn't I start doing this earlier!?