WRONG! Its beside RI/RJC. Kong meng san is the Bright hill
temple, his one is a another one called PEK SAN THENG(bi shan
ting). There take SBST 93/156/157/163 to its doorstep from
Macritchie. Saw quite a lot of light decorations today(morning) and
dint know why. Forgot about Qing Ming Jie 
Take Sv57/59(fastest)56(slower) from Bishan Int to Bishan Rd, cross
the overhead bridge and walk pass RI into Bishan Lane and then you
can see if already. But from there is a bit hard to see. From
Bishan MRT(Bishan Rd) to Bishan Rd(Opp RI), you can also take
Sv13/88/156 and alight the same way
If you want to walk in from a more "bright" way, take Sv156 from
Bishan MRT to Braddell Rd(Bradell-Westlake Sec) then cross the
non-sheltered overhead bridge and then you walk a bit to the
entrance.