The SkyPark is open to the public and from there you have a 360 degrees view of Singapore. Unfortunately the infinity pool is for hotel guests only.
However the rooms are not that expensive as you might think. A night in a double room is about 240 euros.
I’m sorry for some shaky pictures but I had to share the tripod with my sister
The Marina Bay Sands is a luxury hotel with 2500 rooms and suites. It includes a SkyPark at the top of the three towers with an 150 meter infinity swimming pool, the world’s largest outdoor pool at 200-meter height. Nearby is the ArtScience Museum.
It is one of the most complex structure ever built with distinctive sloping towers as steep as 26 degrees by internationally acclaimed architect Moshe Safdie. If you are interested watch the 10 minute video of Moshe Safdie which was part of the competition submission to the government of Singapore.