CHEQUES are still rolling in for Operation Santa Claus 1994 and the grand total after opening yesterday's post was $1,652,364. The Santa postbag yesterday contained cheques amounting to $41,688. Operation Santa continues with a weekend dance marathon. All you have to do is to persuade some friends to sponsor you to the tune of $1,000 or more, put on your disco gear and go down to Rick's Cafe in either Wan Chai or Tsim Sha Tsui and join the Operation Santa Claus Danceathon. Dancers who raise the most money could win a diving package for two in Puerta Gallera, Philippines. For the less energetic, a minimum donation of $30 at Urban Property Management's four shopping arcades in Tsim Sha Tsui, Mei Foo Sun Cheun and Riviera Garden in Tsuen Wan and City One in Sha Tin, will buy a picture of yourself with Santa Claus and a balloon. All proceeds go to the appeal.