What's wrong with the left side in Cable? Have you ever done it, Bob?
All info is correct from above, but not all slots are clear all the time, but should be 95% open at 1200 or whatever it is running now.
I recommending scouting rock garden and cable. Rock garden has many lines, but you might want to have a look if you have never done it. In the lower canyon, the first significant rapid and cable (right after) if in doubt, stay right.
Fun trip, great scenery and cold water. Take a hike up Smith fork at the end, it is kind of neat.
I think it will seem more difficult than it is for your first time. Take your time and enjoy it. Don't be afraid to scout too much. Once you do it once, you will know the lines.