Knowing where Stables are will also be important if you want to buy a new horse, manage your current horses, or buy your trusty companion a new saddle.
If you visit him, you'll be able to reset your honor for three Gold Bars. He can be found by vising a red and white colored cowboy on the map.
Speaking of honor, if you want to reset your honor, you'll want to visit Old Man Jones. These are essentially side missions that can be completed and will become available based on your honor. Online Stranger Missions can be found by looking for an icon that resembles a stick figure.