I like to play card and tile games that I guess don't require gambling, but gambling does make it more fun - games like Bridge; Big 2; 13; Tens; Pai Gow; Mahjong; etc.
Other games I'll play too like Chess and Chinese Chess and various video games too, right now I like a cell phone game called Andors Trail which is RGP sorta like Zelda.
Only other thing can think of is Kareoke and just listening to music and watching music videos...
If learning is a hobby I do like learning stuff like history and religion/spirituality/philosophy etc.