Necessity is the mother of invention

I've admitted before that I have a love affair with Starbucks Mocha Frappuccinos - not the real ones they make at Starbucks, but the bottled ones.  Anyway, after a fun but long weekend (another post), I woke up this morning just needing one.  However, I'm trying to cut back on some things and work a little more exercise into my daily routine.  And then the lightbulb came on...dimly, but it did flicker a few times.  I reasoned that if I walked to the gas station and went out of my way to go up 2 fairly large hills pushing a stroller, then certainly this would cancel out at least half of the calories.  Right?