Always remember to keep your camp site clean of food debris. Marshmallows and hotdogs that fall off the stick, or are discarded for any reason, should be either burned in the fire pit or placed into a garbage bag or trash receptacle. Bags will need to be placed inside the tent or car, or taken to the Dumpster each day before dark. Trash receptacles need lids. Reinforce the lid by placing a large rock over the top.
Raccoons are uncanny at opening things.
Likewise, coolers should be keep inside the tent or car. One good idea is to close the tent flaps, and place the cooler on the inside, over the bottom ends of the flaps to keep the raccoons out of the tent, as well. I once left a watermelon on the ground near our tent. Though raccoons look friendly, they are wild animals and should be treated accordingly. If a raccoon takes your food, do not attempt to take it back from it.