Wow! Stick to natural dunes. They won't slide or collapse.What kind of avy certification is recommended for BC sand skiing?. Only sort of kidding. When I was a kid we used to go to the sand and dirt quarries and play there. Take off running across the top of a huge mountain of dirt or sand then leap off the edge flying about 50 feet down the hill to land and roll the rest of the way down Saw on the news some other kid died doing that a couple years later when it avalanched on top of him. .