Pack foods that don't have to be refrigerated: dried fruits, nuts, and apples and bananas are good choices. Avoid foods that spoil easily -- mayonnaise-laden dishes like potato salad, meats and dairy products. Remember, cut melons need to be refrigerated. Keep anything that needs to stay cold in a cooler, putting the most perishable foods at the bottom under a layer of ice. To skip the mess of melting ice, you can fill the cooler with frozen gel packs or simply freeze bottles of water. Once they thaw, you'll have something to sip on. Also, don't forget something like a plastic bag -- or even a small trash can -- so you can throw away any waste.