Just back from three weeks with at my dad's - managed 1 run, 1 XC ski day, 8 downhill ski days and managed *not* to have ice cream every day.
I borrowed my sister's FitBit for a day to see what it was like. It said I did something like 13,000 steps on the cross-country ski day, and that was a fairly short and slow tour with family. I'm thinking of getting one, not for measuring the 13,000-step days but for measuring the zero step days!