Depends what you mean by interesting!
For example, I've been in St. Albans for about 6 years and whilst it's not a busy city life like London would be, there are plenty of restaurants, bars, a few clubs so a reasonable nightlife and it's got a lot of history (old Roman town, first martyr etc) - quite interesting if that's your thing. Not to mention the architecture and location wise it's close to open countryside - it's not a 'typical' commuter town. There are weekly markets, Christmas markets, it's the home of CAMRA, there's beer/cider festivals.
Thameslink runs 24hrs to and from London in 20mins and goes through the city (except for Saturdays when the last train is around 2.30am or something). So you've got quick access to the city for more entertainment and it's not exactly a 10pm finish which is inconvenient!
See also somewhere like Welwyn Garden City (similar commute times but not quite as much to do as StA - it's not quite as mature and a different style town altogether).