DUBAI For a winter sun tinselfest, nobody does it bigger and brighter and sparklier than Dubai. From November to January the weather cools to a more bearable 19-25ºC and the sun shines practically all the time; and in December there's the Rugby Sevens and a film festival, pre-Christmas designer sales and record-breaking Christmas trees groaning under the weight of lights and Swarovski crystals, for those who like that kind of thing. Everyone says they don't, then they go to Dubai and find that they kind of do.