At the oldest English-speaking university in the world, you should begin with a tour of the various colleges clustered around centre of the city.
Most of these have wonderful architecture, and if you time your trip right you’ll be able to go inside.
Christ Church, Magdalen College and Queens’ College are vital, as is the 17th-century Bodleian Library.
And with an internationally-respected university comes museums and cultural attractions that are a cut above: The Ashmolean, the Pitt Rivers Museum, the Museum of Natural History, all are world-class.