Pros:
A piecemeal and eccentric layout with variety, crammed into a busy city park.
-Amenities: Concrete tees, DISCatchers, very faded signage with maps/distance, practice basket, some minimal next tee signage.
-Variety: A nice mix of foliage. Some holes are more in the open, especially at the beginning and the end of the course, some (thinking of (2), (3), and (8)) have tight fairways of mature hardwoods despite being park-style, and the middle area of (9)-(16) plays in the woods with varying degrees of tightness. This variety affects both gameplay and the scenery (the woods are much nicer than the other areas).
-Shot Shaping/Gameplay: An interesting recreational challenge. There's a lot of swings of personality here, but I'll try to summarize the different types of holes. First is the open type (1, 4, 5, 6, 7, 17, 18), which are basic shots with only a couple of important trees to contend with, ranging from jump-putt distance to a touch over 300'. Second is the thick woods (10-14, 16), which are pretty precise lines that often utilize a creek. Third is a tweener category (2, 3, 8, 9, 15), which have enough trees to clearly define a fairway but more room for scrambling than the woods. Overall, the distance is a touch shorter than average, with only two holes topping 350' and par-55. The creek comes into play a lot. The progression of holes is rather piecemeal, which is fine except it doesn't make the course feel very unified. Many holes are slightly unusual for their length, shape, location, or green.
-Recreational-Friendly: This was one of the earlier courses I played, and I thought it was very well-aligned to my skill level then. Some holes are gettable but there's still challenge for the developing player.
Cons:
Basically all things caused by the close quarters of the park.
-Weird Holes: I'm not necessarily claiming they're bad, but some holes out here had strange lines. (2) presented an immediate right turn and then a totally straight fairway for which I'm not sure what the intended throw is. I think the green for (11) is a matter of poking and hoping whether you'll get through the last line of trees. Hole (14) seemed like a travesty when I played it. As far as I could tell, the line only existed for the first 75 feet, at which point you had to decide whether to throw hyzer along a creek and hope the disc poked back in or follow a walking path-type winding fairway along the left. If someone can PM me explaining the proper way to throw on these holes, I'll reassess this con.
-Navigation: A couple of notable flow issues are caused by the fact that they basically had to squeeze a hole in anywhere they had the chance, regardless of where the previous hole was. (2) to (3) is a confusing walk that spits you out into a field and doesn't tell you which way to turn. (3) to (4) isn't bad, but at first it looks like the next tee is (7). (8) to (9) is a long walk, but the real issue is (16) to (17), which requires you to walk close to half the course.
-Walking Paths: Quite a few holes will be affected by pedestrians. Expect to stop frequently.
-Disc Loss: When I played in May, there was some pretty thick rough close to or on the fairways, and I lost a disc in the ivy somewhere in C2 on (11). I have heard that a lot of maintenance efforts have occurred since then, so if you know anything about that or current course conditions please PM me.
-Hole Overlap: The (3)-(7) range and (9)-(10) with (15)-(16) seem like they could get dicey with errant throws on a busy day. However, I know doubles happens here regularly, so it can't be that big an issue.
-Challenge: A walk in the park for those above rec-level, I would think. Virtually no challenge of distance, and only a few holes have difficult shapes.
Other Thoughts:
Wills is a quintessential city park course, but split into little pieces and jammed into a full park. It's fun and quirky to play and an accessible recreational challenge, but it has severe limitations of distance and some head-scratching holes. Overall, I'd say it's pretty Typical--good fun to be had, but nothing that will change your world.