Just off the top of my head, a quick 16 things
To make it a better experience:
1. Stay in a hotel in Prescott Valley instead of Prescott - the drive is slightly longer, but it is all freeway and you don't have to drive across town.
2. You don't need to bring a water bottle, they'll provide one and there is a jug and gatorade to refill it with.
3. Do bring, ibuprofen, fabric bandages and liquid skin.
4. Don't order the same thing for lunch every day...you have to order for the whole week on the first day
5. Leave for class early and pay attention to the speed limits. They are camera enforced and change suddenly
6. When you're off the paved part of the road, don't follow the car in front too closely...unless you really don't mind dust covering your car. I wouldn't take a Porsche 911, Ferrari or Lambo on that road at all
7. Bring extra money, you'll end up spending it at the Pro Shop
8. The Smithy is very good and very fast...don't wait for the last day if you want something done
To make it a better shooting experience:
1. Buy your Frangible ammo there
2. I'd ship your ammo or buy it there...1200rds weigh a lot
3. Bring knee pads that are easy to get on and off...I got mine at Lowes
4. There is no such thing as too many magazines...and the wise person brings an UpLula loader...I had access to 15
5. Wear a long sleeve cotton shirt...it is actually cooler and better protection
6. A Kydex holster will work better than a leather one...you'll be doing a lot of presentations
7. Bring a good flashlight
8. If your pistol has aggressive grips (G10, aluminum), I'd suggest either changing them or at least bringing a less aggressive spare set...you'll understand why, by the second day