It's a good idea to burst the notion that to bulk you have to be sedentary. I think that we will eventually see a shift of thinking as more and more people become reluctant to pack on the pounds then do an extreme cut to lose the unwanted poundages - and, some muscle as well
It's called a 'recomp', where you minimize fat gains (and the finer sciences of a recomp will see you LOSING bodyfat %) and still pack on lean mass increasing your total lb/kg weight. A good way to go about doign this is keeping your bulkign diet full of clean foods, and as you've suggested in your post, do some light cardio coupla times a week (minimum 20 mins).
Goodluck on your bulk!