Assuming there would be no chance I was seen taking it? The only thing I'd worry about is finding people who could sell a bunch of cocaine without ripping me off, and then give me some advice on my mutual funds.

Otherwise I'd just spend all the money on guns and booze, then cook all the cocaine into straight crack, and lock myself in a room fiending my enormous pile of rocks until they came and tried to take it back. What else could you do really.