Help Me Design My Mid-Life Crisis

So, today is my 39th birthday and I've decided to take the George W. Bush approach to aging. Rather than let the mid-life crisis sneak up on me, I'm going with a pre-emptive strike. Unfortunately, the usual contenders are out: I'm happily married and a sports car wouldn't work for a couple of reasons (one is the environmental impact, the other is that I drive slowly -- actually, I've had Amish people give me the finger). The question, therefore, is what else to put on the list. What have you done or always wanted to do that everyone should do before they turn forty?