WINTER packages to China are being offered by Farrington Travel. The packages cover Beijing, Shanghai, Guilin, Xian or Guangzhou. A four days/three nights stay in Beijing, including round-trip air ticket and daily American breakfast, can be as low as $5,190. Call Hong Kong 2808-2300 for details. ATHENS is the lowest-cost European city, according to London-based Employment Conditions Abroad Ltd, followed by Madrid, Rome, London, Paris and Moscow. PHOTOGRAPHERS - especially those travelling in the United States and Western Europe - need have virtually no fear that airport security X-rays will harm film in carry-on luggage. Exhaustive tests were conducted by the National Association of Photographic Manufacturers in the United States, including film being zapped 100 times in a row. THE Italian village of Pieve di Curtarolo, near Padua, has banned people who live near the local church from hanging out their underwear to dry on balconies. The ban will save tourists and locals from embarrassment, the mayor said. EVEN pets get frequent-flier miles of a sort on Carnival Airlines. Ten round trips on the Florida-based airline, and the 11th flight is free.