subtle_overlord on 10 July 2012
It really depends on where you are. I always get a few hits when I'm at the San Diego Zoo or SeaWorld. I also just vacationed to Las Vegas and I hit up four people just by walking through one hotel, which means that there are people taking their 3DS with them on vacation.
Also, if you work at a high school you are always bound to StressPass with fellow classmates who are illegally bringing their 3DS to school just for the sake of StreetPassing (heck, there are even Facebook groups dedicated to 3DS StreetPassing at certain high schools). I used to work at a library, and if it was right after school ended, I would often get a few StreetPasses at a time.
