"...The rules are simple. Instead of using clubs and a golf
ball, all you need is a regulation-size soccer ball and
your leg. Courses are shorter, the hole is bigger (21-inch
diameter), and same rules of playing golf apply. If you
land in a bunker, you cannot take a running start to kick
the ball. If you hit a water hazard, it counts as a stroke
and you have to drop near or behind land where your
ball hit water..."
http://www.kesq.com/news/footgolf-gaining-popularity-in-coachella-valley/33597998