frisbee golf sounds terrible, until you grab some beers and start playing non competitively. You also can't have a specific course. We would literally just be standing out there, then someone would point at a random object, and that would be the target.
but ultimate frisbee is only fun if you aren't playing on a team. We had a group of frisbee players try to kick my soccer team off a soccer field, claiming they needed it to practice. Since of course you need soccer nets to play frisbee.....