Pros:
Clark Park is the defining Chicago 9-hole; it is the course that set the (sub) standard for the short, flat, boring 9-hole disc golf courses that Chicagoland is noted for. Set in a small neighborhood park, the course shares the small space with tennis courts, playgrounds, a ball field and a walking path. The land has a bit of roll to it so it is not completely flat, but there is not much elevation to work with. To cram 9 holes in the space, the shots are pretty short and the conflicts between holes and other park uses are multiple. The baskets are old DGA baskets in good condition, the tee signs are very good and the concrete tees pads are ginormous (the huge tees in Buffalo Grove are direct descendants of the huge waste of taxpayers money that are the Clark Park over-sized tee pads.)
Cons:
The conflicts are numerous, but the most glaring are #4 and #5 which shoot on either side of two play systems. Both holes require you to throw toward a play system, never a good idea and an especially bad idea on a course that will be attractive to new/lesser skilled players. #4 has the bonus of the walking path cutting right in the middle of the hole. #6 essentially uses the walking path as the fairway. #6 and #7 basically share a fairway; the tee for #7 could be moved over closer to the ball field but that could increase the n00b hyzer shots into the ball field so six of one, ½ dozen of the other. #8 conflicts with everything. The tee is too close to #2's basket, the fairway is in the outfield of the ball field, the walking path is right there as is #1's basket. It's basically a shooting gallery.
The site is lightly wooded, so it really doesn't force you to do anything other than the forced RH hyzer around the fence on #3. I throw RHBH hyzer shots all day here.
The course has classic pitch and putt distances. There is one 300'+ tee shot. Most shots are in the 215'-250' range.
Other Thoughts:
Traditionally what Clark Park has been is the course close to O'Hare that you could hit for a quick round when you had a layover. For years it has been the only Chicagoland course a lot of people have played, and because if that it has pretty much defined Chicago disc golf for a long time. Unfortunately, that means short courses set in small flat parks with numerous safety conflicts. It is the direct ancestor of a lot of bad disc golf courses. It remains today what it has always been; a place to get in a quick round if you want to get out of O'Hare on a layover. Otherwise, it's not worth the trip.