Pros:
Challenging compared to most 9 hole courses I've played. The designers used the given topography (steep drop-offs, hills, valleys) and foliage very well to create some interesting shots. Good variety of shots required and a decent amount of length. The course flows pretty well from hole to hole.
The few times I've played here, I was literally the only person on the course. Clean, tidy, and well maintained.
Cons:
As others have mentioned, there is a bit of poison oak on the course. In the warmer months you need to be alert for rattlesnakes.
The tee signs are useless, they're all blank! No distance, no layout, no par. Why even install the things if there isn't any info on them? Maybe this info will be added at a later date. If it is updated, I'd have no problem adding a half point to this course.
There are several tee pads that were placed on an angle. (#1 especially.) Also, there is one area where there are a couple baskets that are pretty close to each other. I believe it's the baskets for 4 and 7. The problem is that you can see #4's basket from #7's tee and that appears to be what you should be aiming for, when in reality #7's basket is farther to the left and blind from the tee. If they had decent tee signs I doubt it would be much of an issue.
There's a bit of old rusty metal throughout the course, some of it is in small ditches, some of it is just laying about. I assume it's from whatever this land was used for before it became a park.
Other Thoughts:
Overall a pretty well designed and fun 9 hole course despite some flaws. I think my favorite holes would be #5 and 6, definitely the signatures, with an honorable mention for #8. #5 isn't a very long hole, but you really have to hit your line because there is a STEEP drop to the right. If you end up down the hill, you'll have a tough, blind, and well guarded shot towards the basket area. #6 is a cool hole, throwing from an elevated tee box. Hit the gap in the tree line, clear the valley, and make sure you end up far enough up the hill for a decent putt at the basket.
Fairly rugged course, no benches, no trash cans. Pack out your trash! Definitely not a con, just the way it is.
If you're in the area, Hanging Oaks (Penn Valley), and Condon Park (Grass Valley) are both very nice courses worth a visit.