well the land used has something to do with it. They used special road funds around here to resurface and fix roadways. One of the requirements were to install bike paths.
Small problem, the hills are many, varied, and of enough incline and length, to make them a challenge even to seasoned riders. So its rare to see them there. If anything I am more bound to find them on the 45mph roads as those tend to be flatter. Some of them do have bike lanes.
Now we have change the purpose of some parks to be more family friendly and bike friendly, these are normally connected to purpose built bike and walking trails; the Silver Comet is one.
So I think geography does influence it a bit. Even if I were within a few miles of where I needed to go the land just isn't all that much fun to zip about, unless on a motorcycle then those curves and hills are most fun.