A couple of weeks ago, my wife and I spent 3 days touring Yellowstone National Park and Teton National Park. The signs very plainly warn people to stay on the boardwalks. The tour guides more than once warned not only their customers but others to stay on the boardwalks and at least 25 yards from the animals. The rangers have stopped their search for the body of a 23 year old Portland man who walked 225 yards off the boardwalk at Norris Hot Springs, breaking through the crust and falling into the hottest acidic spring in the park. They found a few articles.