San Francisco, California
"Because the weather in San Francisco is pretty much always the same, it doesn't require frequent changing of your skin care routine," says Fusco. "This makes it easier to keep your complexion clear and healthy." Plus, the City by the Bay is very rarely sunny, which reduces the risk of sun damage. Another boon: the city has the lowest number of tanning beds per capita in the U.S., which may be why it has a low skin-cancer death rate.