I actually quite like it as a place, though on a Saturday night the drinking culture is quite heavy. ....
This has got history.
Wasn't it because of fears that the munitions workers would get plastered of a night in Carlisle that the UK govt introduced licensed drinking hours in WW1?
I've never done anything in Carlisle apart from the sheds, involving the long walk to Kingmoor, but it was/is a frontier city, so must have history. Is there anything left of the munitions factories along the Solway? That MUST have history.
You could always go into Carlisle and then come back to eg Appleby* or Kirkby Stephen**, eat and do some walking. Then pick up the Dales train from there.
* Mr YorksRob recommends Armathwaite in the S&C thread, of course

But Appleby does have civilised pubs.
** If you want to eat in Kirkby you will have to walk. The station is a mile from the town.