1. Portland, Ore.
The city of microbrewery mania and home to megastore Powell's Books — one of the few remaining independent booksellers in the country — is No. 1 in sustainability. Declared the most bikeable city in the United States for its 200 miles of dedicated bike lanes, Portland certainly makes forgoing gas-powered travel easy. And for lessons in DIY sustainable food sources, classes are available for container gardening and cheese making, or beekeeping and chicken keeping.