Nintendo recentlyimplemented an update whereby you can StreetPass with other 3DS owners at dedicated hot spots. To make things even easier they have now released the StreetPass Hotspot Finder.
Whenever a Nintendo 3DS system connects to a hotspot, StreetPass data is received from the hotspot’s previous visitor. In addition, your own StreetPass data is automatically uploaded to the hotspot, ready to be transferred to the next person that passes by with their Nintendo 3DS.
You can find your nearest hotspot by heading over to the Nintendo StreetPass Hotspot Finder.