Sneakers have become my go-to for spring. It's often too wet and chilly for sandals, but warm days can be too hot for insulation. My feet run cold, so insulation doesn't become a problem until close to summer.
Sneakers are comfortable enough for walks, parks, kid-chasing, and acceptable enough with dressier items, (if I feel the nudge to actually get dressed...) Canvas and mesh ones can be tossed in the washing machine.
I have loafers, a shootie, and my Thursday boots that I reach for if I won't be doing a ton of walking, and I wear my pair of stompy boots more often in the spring than I expected to when I bought them...
Oddly enough, the Thursday boots get worn ONLY in spring or fall - they are really thin and my feet freeze in them.