We went last year - how old are your children? The main college buildings are in the town and amazing. The church has a tower you can climb up which they would probably enjoy (I had a bit of a girly panic attack and didn't make it all the way), the river is a two minute walk from the center, there is a market at weekends....
We really enjoyed our weekend there! However, in some respects (as with any place/city) it depends on the temprement/interests/age of the kids.