I can really recommend this skybar in Bangkok, the Red Sky rooftop bar at Centara Grand in Central World. It is located on the 56th floor with panorama view over Bangkok!
Vertigo Rooftop Bar in Bangkok
One of my favorite rooftop bars in Bangkok is definitely Vertigo rooftop bar, located on the Banyan Tree Hotel. I can really recommend to visit this rooftop bar when you are in Bangkok!