The rec dept. had water polo at Colony Cottage sports pool a couple of weeks ago.
they played while sitting in inner tubes. I didn't play but it looked like fun.
the hardest part of the game appeared to be staying upright in the tube. It seemed like the rec dept owned the tubes so I would think they will have it again.
http://www.youtube.com/watch?v=lj_auB-PsG0
You might enjoy this Willy