mosha,
It is golf but with a frisbee. The 'holes' (baskets) are placed strategically so you have to make the frisbee (disc) curve and go far to make it to the basket.
See pic...
You have to make it fall into the basket part of this contraption. You do this by making it hit the hanging chains. This knocks down the disc and it falls in the basket. You count how many times you have to throw it from the 'tee' to the basket and that is you score. Most real courses have 18 holes just like regular golf. But there are nine hole courses.
It really is quite popular. Lots of times the courses are set up on actual golf courses with the holes obviously being shorter that regulation golf holes.
Lots of fun and as you can see by sherpahigh's excellent photos, a great excuse to get out in the outdoors and have some fun.