Hmmmm - this is a tough one to respond to...
I mean after all, having screwed up an entire country, almost destroyed it's economy, put millions out of work, and reduced average standards of living is a pretty tough act to follow...
I think he should do something really simple - something that he is genuinely suited for...
I have it - how about being a taste-tester at the Sam Adam's beer brewery???
They've got lots of different flavors, and are constantly coming out with new ones - so he wouldn't be bored... and besides, once Dubya sees how brutal historians and the public are towards him as his true damage toll becomes apparent, he'll most surely be off the wagon... for good...