Hey- I won't be going to Bath Uni (I'll be down the road in Bristol), but as I spent my sixth form and many underage nights out in Bath I'll try and help as much as I can... So here goes: Friday night cheese is excellent at Po Na Na which is in the vicinity of the abbey and although it's underground you can spot the entrance either by the queue or by the lairy looking bouncers at the top of the steps... however, it does get a bit packed and VERY VERY hot... but the cave, souk like atmosphere is good and the drinks prices aren't extortionate. Cheese is also good on tuesdays at Delfter Krug which is near the theatre royal and just off Queens Square. Delfter's also good for having a main bar downstairs which plays different music to the large-ish dance floor upstairs. T's (or The Playground as it's officialy known) has two dance floors- one which plays cheese and commercial music, the other plays RnB and HipHop. It is fairly difficult to find as it's right down by the river and by the beer garden for The Boater Pub but it's always a good night out there. Alternative and Rock with live bands etc, head to Moles which is on George Street (at the top of Milsom street) underneath bars like RSVP and opposite The Litten Tree, Slug and Lettuce, Vodka Revolutions.... George Street does have a few chain bars but they aren't too expensive- for a guaranteed cheap drinks pub head to The Assembly Inn up the hill from George Street, near The Assembly Rooms (wouldya believe it?)
Quickly about other clubs: stay away from Cadillacs unless you enjoy getting stuck to the floor and being leered at from desperate members of the opposite sex, Babylons is good if you're into chavvy atmospheres, and Cube is a bit pricey for the average student but has great seating areas for when you just want to relax. One word of warning though- clubs in Bath do tend to be very very small so you will probably get beaten up quite a bit... also, I got a bit bored by the limited selection after two years as well so try and vary nights out as much as you can.
Best Kebab shop: Bodrum Takeaway is by far the most popular, but there's Marmaris is equally good and close to Perfect Pizza so everyones needs can be catered for then. Nightlife in Bath is good, and as it's quite a small place you'll always bump into a few people you know which is always good fun. Hope that helps!