For visitors to CUHK, you may take MTR train to University Station and then take campus shuttle bus route number 1A or 2 to the second bus stop "Sir Run Run Shaw Hall". Then you may walk to Tin Ka Ping Bulding in 5 minutes.
For details of getting to CUHK, please visit www.cuhk.edu.hk/english/university/visitors.html
For details of campus transportation, please visit http://www.cuhk.edu.hk/campus-transportation/english/campus-shuttle/plans-for-2012/new-bus-routes.html#current .