One of the locations of the famous Momofuku Milk Bar where you can get a whole array of sweets and milkshakes (if you drink them in the store you can get them with booze). The Crack Pie is legit.
Who needs Manhattan? Williamsburg has everything you can possibly want - even an Apple Store. If you do need Manhattan, it's only a few short stops away on the L or J train. There's even a ferry! It’s got incredible views, great music venues like the Knitting Factory and The Music Hall of Williamsburg, and some of the best coffee shops in the world.