Avoid soda and other caffeinated beverages, alcohol, and energy pills. The caffeine will dehydrate children as well as you. Alcohol has no place on the trail; you need your full faculties when making decisions and driving home. Energy pills essentially are a stimulant and like alcohol can lead to bad calls. If you’re tired, get some sleep and hit the trail another day.
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Read more about day hiking with children in my guidebook Hikes with Tykes.