I took, the Oxford University College Walking Tour (90 mn). It was a wonderful walk through this very pretty city. I had the good idea to book this tour at the beginning of the day and it gave me a very good idea of the city, its most beautiful corners and the importance of the university in the life of the city. The tour allows to understand the organization of the university with its different colleges that are found all over the city, in very nice buildings of which we discover several examples during the walk.
Josie was a fantastic guide, enthusiastic, funny and very knowledgeable about her subject. She gave us a lot of information about the history of the city, of the university, but also about the life of the inhabitants, and of the students today with many anecdotes about the different colleges.
The tour was very easy to follow, with a moderate pace and reasonable distances and the small size of the group - we were 8 - made the experience very friendly.
I highly recommend the experience!