It depends on your personality. Try to learn Sanda, Muay Thai, boxing, jujitsu, free fighting, capture, bunt and so on. Want to stay healthy; Fitness qigong, tai chi, form and meaning, gossip, etc.

Want to perform: learn nunchakus, routine Nanquan (just fierce), Changquan (developing bounce), mantis boxing (body shape),

Want to be fashionable: karate, taekwondo, judo, kendo, etc.

Want to learn rhythm: free boxing