“When visiting the Grand Canyon, make sure you hike into the canyon. And be careful not to fall or step in mule poop.” TravelUsaGrand CanyonRoad Trips Book:It’s a Mad, Mad, Mad, Mad Trip: On the Road of the Longest Two-Week Family Road Trip in History Source: It’s a Mad, Mad, Mad, Mad Trip: On the Road of the Longest Two-Week Family Road Trip in History