Lincoln Park, Spokane

I am very fortunate during my stay in Spokane, Washington to be living in an apartment that backs up against a nice little patch of nature called Lincoln Park. In the snow, my wife and I can snowshoe out the back door and hike over to our own private sledding hills. Now that the temperature has risen, much of what we thought to be permafrost is thawing. Our afternoon reward for studying was strewn with slick rocks, muddy runoffs, iced puddles, and to say the least, uncertain footing. This brought to mind a conundrum:

When is a walk in the park no longer a walk in the park?