As an interracial couple, one of our favorite activities is to count other interracial couples we see while we're out shopping. Our record is 8 couples, seen in a single 1 1/2 hour trip through the grocery store. But then, Austin is different from the rest of Texas in this regard, I suspect.
One thing I noticed growing up in NY is that you see very very few inter-racial couples in the more proletarian "outer boroughs". But they're very common in cosmopolitan Manhattan.
Good bet dating couples from around the city come into Manhattan for a change of scenery, and perhaps to escape stares and barbs.