You're in Oxford, but haven't got time to get to know it. Here's the 30 second guide:
George Street/Hythe Bridge Street Right in the middle) - Unsophisticated straightforward bars/drinking but gets rowdy on a weekend.
Cowley Road (East of the city) - Cosmopolitan, studenty but quite strung out. Gigs, restaurants and a few pubs. Lots of fried chicken.
Jericho (North) - Poncey. Upmarket bars and London prices. Think cocktails not beer. Friendly atmosphere, interesting mix of people.