Flip is at the top of my lis, but maybe a trip to Georgia, the the center of disc golf, visit the huge disc shop there and play tons of the great courses there. I think that could easily top Flip City.
I'm surprised this place doesn't get more love that it does. I was down there a couple years ago, only got to play one of the courses, but it was amazing. The pro shop and museum are also pretty cool. They have a big screen tv in one of the rooms, with some chairs and couches, and the guys there are awesome. A buddy of mine left his putter in the basket on 18 and they sent it back no problem. I can't wait to get back down there and get in all the courses.