I just didn't see this one here anywhere and wanted to throw it in. Texas Horseshoes is a great game. I'll get more detailed instructions up here soon, but you're tossing over-sized washers onto a long board, about ten feet away, and trying to get them to land/bounce into one of three different holes. Just like in traditional horseshoes, you can cover and really screw the other team up.
It's a blast and is pretty low impact. My Uncle has a bad back, but he loves to play this game, especially if he has one of those malty beverages mentioned in some of the other posts in one hand