I wouldn't recommend whips because they require some skill to wield properly. And no one likes to look stupid when they are beating the shit out of someone. So I would go with something simple. Golf clubs, hockey sticks, tire iron, baseball bats are all acceptable. You might want to steer clear of lacrosse sticks, badmitton/tennis rackets. You just can't swing them hard enough. Plus you still don't look menacing when you use it.