There's plenty here in Rochester, as others have stated. Basil Marella in Greece is my home course - very wooded. I enjoy running the wide-open (but relatively short) Ellison Park course.
Since I play Ultimate, I also have (at least so far) refused to adopt real disc golf discs, instead playing with a "lid" (lid = Ultimate disc, the Discraft Ultrastar).
I played club ultimate in college, and I still play club on fairly competitive teams (not elite), as well as the leagues here in Rochester.