On a recent hike, I was asked what comes to mind when I think of spring. I liked this question because it's not somethi ng I hadn't really thought about before in any co ncrete wa y . As I thought about it, I realized that f or me, spring means the change in light and the burst of color from new flowers. Springtime flowers in Redfield Alley in Russian Hill Since starting Urban Hiker SF last summer, I have gained an acute sense of the changes in weather and season. During the summer, the bushes and trees b urs t with fruit exhibiting nature's abundance throughout t he city. As fall comes, the rain transforms the b rown, dusty hilltops into lush green hideaways. An d there are much more subtle shifts too too. There's a changing of the guard for the city' s flowers see mingly every few wee ks. There's al ways something new to look at. Now is a great time to get out for a hike because there is evidence of spring almost everywhere you look....