I love hobbies in the game, especially creative ones! I always want more skills and hobbies added to the game. Some that I loved that I think came with TS2 freetime were Pottery and Ballet. The potter...
I would love sewing. With an addition of a challenge similar to Simple Living, where you won't be able to create new outfits unless you've made or bought your clothes. Pottery would be good too! And sculpting.