I watch most sports but the ones I avidly follow outside of League are:
NFL - Philadelphia Eagles
Soccer - Aston Villa, Celtic, Sydney FC, Socceroos
Rugby - Manly Marlins, Waratahs, Wallabies
Cricket - Sydney Sixers, NSW, Essex, Australia
I'll watch the major golf and tennis tournaments when they're on. No particular favourites other than cheering on the Aussies.
As far as playing, I haven't played anything for a while, but really should get back into golf or something as I'm getting far too overweight. Played League until I was about 20 then played Union until I gave it away at about 34. There was a few years when I played both.