We're taught that we should stay away from vices -- but they can be so fun, right?! Get down with your bad self at one of the best hotels for indulging the seven deadly sins. Of course, they're all in the three wildest, biggest party cities in the states -- Miami, Las Vegas, and New York City. And they're all fabulously luxurious spots, too -- after all, it's gonna cost you to be bad in more ways than one. We dare you to check 'em out -- just don't look back!