The buses are pretty good and frequent. A Kangaroo is £2.70 and gets you unlimited travel for the day around the area.
There are loads of places to eat. If you want cheap and cheerful, Bella Italia in Market Square does a 50% student discount with NUS on a Monday night, and I think 20% on other nights. I've also been to Zizi's, the Slug and Lettuce, Ultimate Burger and Skinny Sumo (more expensive, but great fun for a date!) amongst others.
There are student discounts all over the place. You can get a Tribus card for free by filling in a form in thr Hog's Head or Yates', and then you get 25% off all food and drinks apart from on Friday or Saturday nights in those bars. Joining the Law Society even if you don't do law will get you a law card, and therefore discounts in load of bars and restaurants all over town... or get lucky and find half your best friends are lawyers and save yourself the bother of getting your own!