My biggest hobby is Airsoft. Played paintball for years, including the Toronto X-games, and 4 straight years at the World Cup. But sadly, I got too old, too heavy, and it kept getting more and more expensive.
When I found Airsoft, I realized the weapons were more realistic, more accurate, and with greater range. It also allows me to keep up my weapon handling and basic shooting skills. I don't play for fun though. Only team competitions with lifelike military strategies and military/law enforcement training; (kill houses/hostage recovery/etc...).
Besides that, my hobbies revolve around racing cars, boating, fishing, and riding motorcycles. Used to be really big into SCUBA diving, but the real world and a career made me lose enough of my time to do that actively anymore.