Choppasmith
Member
Driving around just to get streetpasses seems a bit extreme, but I am lucky enough to get 15-40 passes a day just walking.
Personally, I use it as incentive for exercise. Plan a route on my bike based on the zones in my area (I actually have 5 within a 2 mile radius of my house). In my experience bike riding triggers more Play Coins than keeping it in a car too. But then if I'm out running errands with my sister, she been cool with stopping by a place for me to get tags.