Pros:
Good signs make it easy to navigate from hole to hole and find pin placements. Good variety in long and short holes with scattered obstacles. Holes 5-7 were my favorite with lots of obstacles and tricky out-of-bounds.
Cons:
Not usable at all times. If another function is happening in the park, disc golf is not an option.
would like to see more obstacles on some of the open holes.
However, it seems that not many people use the baseball diamonds or B-ball courts, so it's not really an issue.
Other Thoughts:
I didn't have any trouble with the fences or private yards... but I do throw quite low and used mostly midrange/control discs. I think that for the area that this course is set up in, it's great. Sure maybe not the best location for a course, but where else would you put one in Fox Lake? It's close to home, and honestly better than Crystal Lake, Waupan, and Markesan in my opinion.
ADD: I just played again recently and am excited to say that I threw a new record distance of 490 ft on hole #4 for and easy deuce! (disc used was a beat up destroyer with a slight tailwind. From the tee it almost look like it was an ace! How sweet would that have been!!!)
ADD 2: I've played this course well over 12 times and have only once run into people using the ball diamond. It seems that this park is mostly abandoned and the DG course is one of the few things (aside from the pool, which shouldn't be an issue if you've thrown a disc more than once) that is used on a regular basis.