I'm partial to Fantasia Gardens and Fantasia Fairways myself
Winter Summerland is entertaining and better than the majority of other mini golf courses in America. However, both courses there are the same, but opposite. For example, several corresponding holes on both courses have the same layout, but are themed oppositely (you'll shoot into a sandcastle, or into a snowcastle)
Fantasia Gardens is a classic minigolf course with a great theme. Each hole involves a different part of the Fantasia movie.
Fantasia Fairways is more like a miniature golf course instead of a minigolf course. It's like a shrunken golf course, except that you play with a putter instead of with the entire spectrum of golf clubs. You putt from a tee and go until you hit the pin. Along the way, you'll find hazards like sand traps, rocks, and rough. It's really a lot of fun, especially if you don't care about your score and you just smack the ball.