Well, I don't have to say much really except that I'm really, pleasantly surprised that I have finally located this hidden gem of the north: Sembawang Hot Spring!!
More about the place can be read here at Remember Singapore and at this Infopedia.
The view opposite of this entrance - Seletaris condo (the one beside Sensoria condo) behind the treesThe signage after you walk thru the path--meanig, you're at the right path!
And here's the map (from the Net):