Idaho has a great deal for youth hunters. In SW Idaho I would look at units 32, 32a, 39, and 40. 40 is a 2-pt hunt, which means during the general hunt you can't shoot a deer with more than 2-pt's on one side. It can have 15 pt's on the other side. You will typically find quite a few other hunters, especially on the weekend. During the week it isn't so bad. Will it be just you and your son? Have you ever hunted mule deer before? You should consider that depending on where you go you can either hunt elk simultaneously or when deer closes, elk typically opens the next day and as a youth your son can get a tag very reasonably. While mule deer meat is very nice, it isn't as good as elk. To consider this you would plan to come somewhere in the time frame of the third week of Oct and the first week of Nov.