Spread across the top three floors of the Marriott hotel in Thong Lo, Octave is a multi-level rooftop bar culminating in a 360-degree circular bar on the 49th floor. It serves cocktails and Asian-inspired bites against sweeping views of the Sukhumvit skyline. Popular at sunset and into the night, the lively lounge is a favourite among both visitors and Bangkoks after-work crowd on the east side of the city.