For me, one thing, and one thing only marks the first day of spring. No, it's not the vernal equinox. Robin redbreast? Phooey. Spring begins on the first day of the year that I buy an iced coffee. It was in the sunny with temperatures in the mid-50s on Saturday, and I had my first Dunkin' Donuts Iced Coffee of the year. And let me tell you, it was DIVINE. Too bad temperatures are dropping once again.