Stay Hydrated,Keep lots of pedialyte in your cart, it's pretty much flavorless like water but it's packed with electrolytes. Keep high carb snacks on hand, avoid sweet snacks so you don't get a sugar rush and then the crash. Bring extra socks, change them out every 9 holes so your feet don't get punished. Bring tape for any blisters that pop up, tape areas that are likely to blister to avoid them. Lots of rest and high carb meal prior to starting.