Pros:
Marinette City Park offers a variety of shots from thinly wooded such as #1, #14, #15, and #17, Tunnel shots on #3, #4, #11, #12, and #16, fairly open holes on #7, #8, and #9, and significant elevation change on uphill #2 and downhill #8 and #12. Some of the holes such as #7 and #8 finish left, while some such as #10 and #15 finish right, requiring golfers to be able to throw a variety of shots in order to score well on this course.
Some specific hole notes:
#8 is always fun because it's a 400 ft wide open downhill shot. Watching your disc travel towards the basket on this hole is quite a thrill!
#11 has a very steep drop off on the left side, eventually into a creek. This tends to be the hole where people lose their discs.
Hole #16 in my opinion is by far the most difficult on the course, being 380ft with a thin fairway between VERY thick forest. The tunnel through the woods holes reward accuracy over power, but this hole takes it to the extreme. If you get outside the fairway, your disc is almost guaranteed to stop traveling forward because of all the pine trees, and you'll most likely have to use a stroke just to throw back into the fairway. Hole 16 is posted as a par 3, but the best I've ever shot on this hole is a 4. In fact, I've never seen anyone par this hole (though I'm sure it's been done.)
The course is safe, easy to find, easy to get to, and is in town. The designers did a great job utilizing a limited amount of space to make a solid 18 hole course. The tee pads are nice, and the signs are consistent and helpful. There is a helpful "next tee" sign after #10 and I believe one between #7 and #8 as well.
UPDATE: The Tee sign on #14 has been moved to the other side of the tee pad, which is much better, less frustrating, and safer. It was very easy to hit one's hand on the post when it was placed on the right front edge of the teepad. Furthermore, it indicates that someone is listening to player feedback and making adjustments.
Also, a mailbox with scorecards has been added near hole one. This is a very welcome addition. The combination of these to updates has convinced me to bump up my rating of this course from 3.5 to 4.0. It is a great course!
Practice Basket has been added. It is behind the work shed between hole #1's Tee and the road.
Alternate #12 has also been added. It's a nice little uphill hole with a tree on the right and the road on the left. To find the tee walk towards the road from 12's basket and turn left down to the rubber mat. Rubber mat is a meh teepad, but it's still an fun addition to the course.
Cons:
The tee pads are a little short. I end up starting behind the tee pad on most of drives here, and still occasionally will run out of room and not follow through completely. The tee pad on #5 has some permanent bike treads from someone riding through it as it was drying. This is irritating in that the tee pad is uneven and puddles of water always form in the shallow spots.
Some of the posted pars here make no sense. #1 is 286 feet with a clear line and is listed as a par 4. Hole #4 is a generous par 5 at 350+ through the woods (though I could see maybe calling this a par 4.) Hole #6 is just over 300ft fairly open and is a par 4. Then #16, an insanely difficult hole, is a par 3. My guess is that the confusing par choices is a remnant from when this was 9-hole course Some of the generous pars on the front make up for the difficulty on the back. I usually end up ignoring the posted pars for my own edification and end up playing everything as a par 3 except #16.
Bugs are thick in the summer, and the area leading up to the pin on #8 (long downhill shot) often has standing water everywhere.
Other Thoughts:
This is a city park that people use. Be sure to watch out for pedestrians and cars, as a street and sidewalk run through the course. People occasionally will park here to eat lunch and take a smoke break or things of that nature. I once threw an errant shot #1 when I should have waited for someone to walk past. If you hooked an errant shot on #6, you could potentially throw into a playground area with young children. If you are afforded the opportunity to play this pleasant course, please be mindful of nonplayers.
During the summer and fall there is league play every week night at 5 or 5:30 depending on when it gets dark. outside. Marinette Area Discgolfers also hosts a weekly Saturday Bag Tag event the first Saturday of the month.