Using StreetPass, you can interact with other Animal Crossing: New Leaf players and have them come to your town! Check out the HH Showcase to the north of Main Street to meet them (and maybe even collect a gift!), then visit their home in one of the three HH Showcase plazas. And if you see a piece of furniture in a house that you like, no problem – most items can be ordered from the HH Showcase catalogue* and delivered in the post, meaning you can add to your own personal collection too!
* Only items available to buy on Main Street can be purchased; rare items cannot be ordered. Up to five items per player can be ordered in one day.