One of the best views of Singapore for only $6.
Check out the website for all the details about getting there and times open etc...
A full 360 view where you can see downtown, sentosa island, China town, even all the way to Indonesia...
The website says it limits the number of non residents to 200 per day. Not sure how hard this is enforced.
You do need a metro EZ- Card to access the gates.
Take the metro to Outram Park, then exit G - Police Cantonment Complex.
Cross - Neil Rd and walk to the management office in tower 1g.
Not to miss in Singapore