I was thinking about this earlier and I'll put it out there - is there anything special about your culture that your FI enjoys? Music, food, clothing, etc.
I'm West Indian and my FI is Italian - we enjoy each other's food tremendously. He loves oxtail and rice, curry chicken and okra and I adore gnocchi, sausage and basically any stuffed pasta.
The music thing is touch and go; it's not like I'm going to start listening to Opera but FI is pretty into mainstream reggae - definately not the underground stuff I like.
Where's your cultural crossover?