Gardening, mending fences, and maintaining a secure perimeter.
There won't be anywhere to go if gas prices rise to that level, especially in a relatively short time. Any remaining small businesses, "the backbone of America's economy" will dry up and blow away. Food stores will have few items, and what they do have will cost so much that no one could afford them. Most of this nation will be at the mercy of the federal government for handouts and medical care. And who is to say that the feds, made up of people, wouldn't also collapse under its own weight, greed, and individual self interest?
The U.S. is simply too big, too spread out, to be able to survive high gas prices like they have in Europe. Violence would flare, anarchy would prevail.