I'm not a big game person, it's just not my cup of tea, so I know the importance of finding people on the YM Team who like games and are good at coming up with games. Here are two of the games we like to do outdoors and on the beach during the summer months:
Poleish is lots of fun
Spikeball is a blast
This is one I would like to figure out how to build an affordable/portable arena. The game in which I broke my big toe at the top knuckle.