Make sure you take one of the many guided castle tours on offer there, Ilan:
Not to mention indigenous dishes:
And if totalitarian architecture doesn't make you nauseous, then have a look at Ceausescu's old hideout:
These days it's supposed to be worse for wear though and a derelict ruin.
But whatever you do: Don't pet those skinny "shepherd dogs"
which frequent the Romanian capital at night and in the weewee hours of the morning searching the urban garbage (without raising any panic with the natives, the wolf is regarded as a mythical figure in Romanian lore and as a bringer of good luck, attacks on people have not been reported).