At once a thriving center of business adn a laid-back university and resort town, Tucson is Arizona's second-largest city, but tee are times when it still feels small. Even the short and busy winter is prime time in sounthern Arizona-when the weather is mild adn the steady flow of snowbirds seeks out warmth. And surely there's no more gratfying time than deepest January to soak the sun, perhaps after a relaxing spa treatment or during a round of short-sleeve golf. But if those are the pleasures that make the desert so right for a getaway, it's the quieter pleasures of spring and fall that make it such a desirable place to live. Come to Tucson then-or even in high summer-and you can really feel the rhythms of the desert and the depth of Arizona's Native American, Spanish, Mexican, and Old West roots.