From the Romanian National Opera at the western end of Bulevardul Mihail Kogalniceanu to the presidential (and formely royal) palace in leafy Cotroceni, this has long been one of Bucharest's most exclusive residential neighbourhoods. Fine houses line many of the district's streets, while the city's Botanical Gardens are also found in the area. While there is a fair amount to see and do during the day, the area is not overblessed with nocturnal attractions: the opera itself, at Eroilor, is an exception.
Take the metro to Eroilor (for the opera). For Cotroceni Palace or the Botanical Gardens, take bus No. 336 from Piata Universitatii.