in terms of campus there's four bars and one club
east slope which is my favourite is a very student-y regular pub, it's a little on the grimey side but in that kind of endearing good ambience way, its the only real place on campus where you get to see bands, apparently loads of decent bands have played there over the years, and i saw the kooks there a few weeks before they got signed.
There's always good djs in there too I'm a bit bias about east slope cause this coming term i've got every other saturday in there booked, so I can promise a few nights of eclectic music, from motown to eighties electro, via mid nineties dance, brit pop and emo. With added does of classic pop.
Falmer bar is a bit further away from the residences near the library and tends to be a bit more second and third year, tends to be a bit busier during the day than the evening, and they do food which is always good
then there's grapevine, which is a bit of a strange one above one of the campus on. If i were being mean I'd describe as a bit of an airport longue but its definately better lit and non smoking so tends to attract a bit more or a rendy shoes and shirt crowd.
and finally park village longue which isnt really much bigger than a longue, never seems to attract the same attention on campus, its small and intimate but definately has its fans and i can kinda see why.
the club is the hothouse, which cant really be faulted, its not the ritz but its definately a lot more about the experience and company than the surroundings, its always rammed on a friday and saturday when most of campus pretty much decamps there, and its so much cheaper than a trip into town and a nightbus/taxi home.
Again I hear there is going to be a very good wednesday night at the hothouse in freshers week if i do say so myself....
hope that prooves useful