i went a few. Leap frog (small and more for their own hotel guest), Red sky bar - there is happy hour buy 1 free 1, nice view at night, cosy place. Just came back from Octave Bar at Marriott Hotel (near Thonglo bts) currently should be the most IN bar, beautiful sunset, happy hour from 5 to 7pm also buy 1 free 1, night view wasnt as great as the rest but sunset was good. if looking for 1 near to BTS can try octave bar. most importantly, guys can wear shorts (but must be decent, not torn) and wear shoes, no slippers. unlike sirocco have to be more formal wear. during the happy hour, drinks was about sgd 10 per drink. cheap and good as compared to sg.