One of my favorite techniques for converting photos to black and white is with Nik Silver Efex Pro. Mouse over the image above to see the color version. In black and white, it looks as if it could have been taken long ago, creating a nostalgic look. I like the color version, it's fun and reflects Cuba as it is now, (although it's virtually unchanged including the cars). Portraying the scene with the vintage appeal of black and white just seems to fit.
Tip - Create a faded color vintage look by reducing the opacity of the filter layer. You can use DSANDIDGE as your coupon code for anything Nik. Make great pictures!