By Tobias Carroll There are certain outdoor activities that make a lot of sense when you think about them — swimming, for example, or even climbing trees. Others might make you pause and think for a little bit. Take water skiing. What, precisely, made someone think, “If I wore skis in the water, I’ll bet a boat moving at a certain speed could pull me behind it as I stood up?” Well, it turns out that that first took place 100 years ago. As detailed in a new article in Smithsonian Magazine, Ralph Samuelson was the first person to successfully waterski — a moment that took place on Minnesota’s La…