Perhaps you’ve seen the trend on a hike or near a creek; impressive piles of rocks stacked by humans in a precarious counterbalance. These are a nod to Cairns (of Celtic and Gaelic origin), and all the hikers, bikers and backpackers seem to be doing it! Come with The Nature Bus to spend a day by the creek filled with activities and play. Learn to build these Cairns and create art within nature without ever causing it harm.