I am lucky enough to have a bike path that goes right near my office. It is about 1/2 mile on a street with a bike lane on it, then the rest is on paved bike paths. The path section is about a 13 mile route one way that I do as an out and back.

I use that route for my weekday shorter rides, but we drive out west of Houston to do our longer training rides on weekends where we can get mileage from 25-70+ miles if we want. Most of those routes are either on quiet country 2 lane roads or bigger roads with wide shoulders to ride on.