hi smak,
i have attempted once from the Wasabi Yoga place to Raffles Place.
Will try to retract the directions here.
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1) At Raffles Place, go towards Boat Quay starting from the UOB Centre
2) Walk through the Boat Quay street of restuarants towards North Bridge Road (Spore River should be on your right)
3) Cross the under tunnel below the Elgin Bridge of North Bridge Road
4) When you exit the tunnel, you should see Riverwalk apartment
5) Turn left and cross Upper Circular Road (Should be walking towards rows of shophouses where the Singapore River is at your back)
6) The next road should be Carpenter Road
(If you see a post box before you cross the Carpenter Road, then you are on right track)
7)Wasabi is situated at the building after you cross the Carpenter Road
8) Take the first stairways (immediately after the accessories shop)
Can refer to this map for an overview
http://www.streetdirectory.com/asia_travel/travel/travel_id_1/travel_site_1631/