Aranypart II is worth spending a day - or a night ;) - there.
The beach is full of young people all the time, and wherever you go, you bump into a club, I'm sure you all are gonna find a place where they play YOUR music. :)
If you wanna go to a movie, forget multiplexes, Rómer Ház is the place! It's also a movie, a club and a bar in the same bulilding.