I think I would sit down with the map/route and build a cue sheet like we used to use on organized rides. You know, start mile 0...ride so far, make a right on X street at this mileage. Show how far on each leg and total mileage at each turn. Clip it to the cables and ride it a time or two until you know the turns. I have only a short 8.25 one way commute, and have made some wrong turns on the way home a time or two until I learned all the sight cues....

Tractor Tom in Okeechobee, FL