I was dx in Dec 2004, and although I don't play in a league, i do play shinny 2-3 times a week with a few friends on a local rink.
Biggest thing is just to know your limits... don't push it too hard.
What position are you? Goalie could be good (or bad depending on who you talk to
Also, might be a good idea to let one or 2 of the guys know your condition, just in case.
Keep fit and have fun! (sorry... couldn't resist)