i'm an avid discgolfer. there's an amazing 18 hole course spread through a park in santa barbara, ca. the "holes" are 2 ~3ft rings spread vertically about 3.5 ft apart forming a cylinder in the air, usually with a chain link kind of curtain draped around inside to keep your disc from bouncing out when you get it in. this is all mounted on a ~4 ft pole.
i actually like it better than real golf for a few reasons.... you can put "holes" in way more rugged and out of the way places and between trees, making for more scenic and challenging experiences and increasing your hiking excersize compared to wheeling around a golfbag on the green or using a cart.