My dd is 22, never been a shopper or mani/pedi kind of girl, here are things that have been fun over the years, they change as she gets older and her interests evolve.
Theater performances (we both love musical theater or any plays really, doesn't have to be the highest level we've seen loads of great community stuff)
History museums/history walks
Destination bookstores (as in, need to travel a bit but bigger/more interesting than our immediate local ones)
Cooking new recipe at home (i'm sous chef)