The tip is to head to Tower 3 of the Marina Bay Sands hotel where the access to the SkyPark is. Tell the concierge that you and your friends want to go to the club. They will give you a pass after which you will be lead to the elevator. Press number 57 and don't leave your confidence on the ground floor. Get a stamp if you haven't and grab an empty seat even if there is a "RESERVED" sign because if it is empty and doesn't have a name then it means nobody is going to kick you out any time soon.
Order a beer, wait for the sunset and just enjoy the view. If you arrive after sundown, the view is as exhilarating as well. You just need to relax and have quality time with friends and family. The music, the strobe lights and your vodka sunrise will take care of everything else. Do mind the tab because every liquid that flows into your esophagus is not free. Pass this tip and enjoy!