My family is driving down from St Paul to St Louis and would like to identify the most interesting and scenic route possible. On the map, driving all the way down I-61 looks appealing, but we've noticed that this itinerary never comes up on Google Maps -- which suggests that it's prohibitively time-consuming or otherwise not a good idea. If we went this way, would we spend too much time waiting at stop-lights in small towns? If so, what would be the best way to go? We aren't in too much of a hurry, and we wouldn't necessarily need to hug the river all the way down, although some of the time would be nice. Thanks!