see if this is any help
if you are driving, go up the slope, pass the guard post (if you are stopped, just tell them you heading to Macritchie). Drive to the end and make a left then a right turn. Then make another left turn into Macritchie, drive till u come to the PUB station. (advise, don't park your vehicle at the entrance of the PUB station) then see the above for direction
hope my direction is clear enough[/QUOTE]
If you're driving, can park at the SICC visitor carpark, free parking and not very far from the PUB entrance.