We play a game called Cat polo.

2 or 3 boats on a side, a large beach ball (the hard kind are better) and two goals, the rules are
1. as soon as you pick up the ball you have 30 seconds to kick it,
2. the team with the most goals after the time (whatever) wins.
2a, Alternate Rule 2. the first team with 3 goals wins.

The goals are perpendicular to the wind.

Of course this game is played with real catamarans and on soft water but y'all yanks can play this summer when you thaw out.....