EDITOR'S NOTE: Since this article was originally published, all outdoor activities planned to take place during Rudolph Country Christmas on Saturday, Dec. 13, have been canceled. Read more here.

When it came to walking and general mobility, Colin Dowse was a late bloomer. He was 3, nearly 4, when he learned to walk, having scooted around until then, on his behind. By the time he was 6 years ...