What are some interesting pastimes?

I'm a junior in high school, I'm really focused and school and all the work I do eats up my time. I hate how schools my life and I want some interesting pastimes to share with people when they get to know me. Sports are the first thing that come to mind for people my age, that's always the conversation starter, "So, do you play any sports?" But I don't like sports I'm not a competitive person. I want something stay in shape since I'm in good shape now but I'm sure my metabolism will slow down. I've been looking into things like belly dancing or salsa dancing they sound fast and fun and sexy. I also consider things like martial arts and fencing, any unique ideas?