For want of a better place to put this, here are some recommendations for things to do in Grange-over-Sands (following a recent trip):
Train over the viaduct to Arnside: check the train times as they are irregular but it's a nice trip over the bay (6 minutes, £2.40 return) to have fish and chips. The fish and chip shop with the blue door came recommended but you can't take dogs in, you can't fit prams in and the outside toilet has no running water to wash your hands but there is an inside toilet
Pork pies from Higginson's butchers. In fact, anything from Higginson's butchers, but the pork pies are delicious
The garden centre (in one of the town car parks) is well-priced and well organised. Lots of good shrubs on offer.
The Treatment Rooms (on the main street, next door to the Co-op Pharmacy) is recommended. I only had a manicure and Shellac but I'd go back again as they did an excellent job. They do loads of other treatments and the staff are lovely.
A walk along the promenade is nice although the sea no longer comes up to the sea wall. At the end of the promenade (by the old Lido which is sadly closed), there is some outdoor gym equipment which is good fun.
I gather that a lot of the pubs in Grange are full of teenagers during the evening and that most adults go to Cartmel for a night out. I didn't go in to any of the pubs so can't comment on them.