In no particular order.
Oregon Park - Marietta, GA: I live a mile away and have played it hundreds of times. It's a solid course, nothing spectacular, but it's where I learned the game and I have countless memories of different milestones as my game has improved. Wide open spaces for the dog to run.
Hobbs Farm - Carrollton, GA: Best course I've played in Georgia by far. Diverse and challenging layout, meticulously maintained, all infrastructure like bridges, catwalks, signs, benches, teepads all top-notch. John Houck design.
Veterans Memorial Park - Bridgeport, CT: I get to play this very underrated course whenever I go to visit my parents. Mostly wooded with lots of variety and elevation changes. It's unexpected to find such a well-designed and maintained course in Bridgeport. And it's in a beautiful old hardwood forest with lots of massive oaks, babbling creeks and jagged outcroppings of granite to navigate.
Perkerson Park - Atlanta: Huge city park in a sketchy part of town where some dedicated volunteers carved out a stellar course. It's massive, mostly wooded, with lots of variety and great use of elevation. The kind of course where you'll throw everything in your bag.
Steady Ed Memorial - Appling, GA: Another well-designed and maintained, huge, diverse course, mostly wooded, with portions playing along a gorgeous lake. This is considered the "fun" course of the 3 at the IDGC, still really challenging but accessible for us mortals.
Honorable mention:
Sedgeley Woods - Philadelphia: One of the old Steady Ed designed courses from the 70's with a huge and active membership. Home course of my friend Jim who taught me the game. Mostly tight and technical, most holes on the shorter side but it's been expanded to 27 holes. Might be the most unique course I've played.
East Roswell Park - Roswell, GA: Just a fun little course that I enjoy playing some weekends. Some forgettable holes and some really tight & challenging ones.
Harmony Bends - Columbia, MO: Highest rated course on this site last I checked. It would probably make my top 5 if I could play it regularly. The day I was there, I did not bring my A game and got eaten alive. Playing this course under par would feel like an achievement.
Richmond Hill - Asheville, NC: Beautiful property up in the mountains. Crazy steep hills throughout but still a blast to play.
Disc Side of Heaven - Jonesboro, AR: Aptly named, as it's one of the most stunningly beautiful places I've ever seen. It's also insanely long and difficult and not a course I could play on the regular. But I was there on the Monday morning after the J'Boro Open in perfect sunny weather without another soul around except Steve Dodge and crew cleaning up the tents and whatnot, and I felt privileged to be there just to take it all in and take a million pics.