Plan some take-along foods that do not require refrigeration like peanut butter, hard cheeses, fruits and dried meats.
Pack perishable ready-made sandwiches or cooked foods in a cooler.
At home, pack right from the refrigerator.
Use insulated cooler or frozen gel-packs to keep the temperature inside under 40 F. Note: Large blocks of ice melt more slowly than cubes.
Keep beverages and plain water in a separate cooler. This keeps the perishable foods safer as the drinks cooler is opened more.
Partially bury the coolers in the sand, again shading them with a blanket and umbrella.
Perishable foods left out of refrigeration for over two hours--one hour when it's above 90 Fahrenheit are not safe and should be discarded.