It would depend on where you're coming from and what you like to do. Personally I come from a big city and like to go on nights out so Lancaster is a pretty weird transition with not as much to offer in terms of the night scene, but there seems to be a lot to do in terms of historical and cultural places to visit, and it's not far from the lake district
and there's busses to morecambe so you can go to the beach and stuff which is cool. It's quiet and pretty and has a nice homely feel to it, the people in the town are usually pleasant and there's usually a lot of dogs around? So that's cool lol. There's a decent handful of pubs and bars, only one real club which is run by LUSU (though two if you include the Glow Rooms part of Dalton)
Can't think of anything else right now because I haven't explored as much as I could have, but hope this helps a bit