no of bus stop of bus a31 before it reaches tsuen wan.

from hongkong airport i would like to take bus a31, but i dont know where to get down or how many bus station i will count before i get down from the bus., by the way i will check in at silka far east hotel at 135-143 castle peak road in tsuen wan, hongkong on feb. 23, 2012, im afraid I might be lost. thanks, hope you will help me.