Pros:
This course plays through a fairly large park, and the course part of it seems to be for disc golf only. I can't imagine it being used for much more unless you just wanted to walk your dog or something. The park is pretty isolated as well, so there are few distractions during your round.
Most of the teepads (with the exception of holes 9 and 10) are concrete, and the baskets were in great condition. They appeared to be a mix of Innova DiscCatchers and Lightning-style baskets.
There is plenty of parking available. I played in the pouring rain so the course was empty, but I'm guessing that parking will be available even if it is packed.
The signs at each teepad are phenomenal, offering many different lines and giving different baskets that you can throw to and the distances to them. All of the teepads have benches as well, and there are several trashcans spread throughout the course.
Now for the course design itself:
The designer of this course did a spectacular job with the land available to them. Although there is zero elevation change on this course, there is plenty of challenge due to the trees, and they did a great job of creating lines and fairways where many would have just seen a large, wooded area. Most of the holes on the course are in the 300-350' range, so this is a great course for the average amateur golfer. A few holes have multiple teepads and/or pins to throw to (hole 13 has two of each), so this course will never get stale. There are enough trees wanting to challenge your drive and approach that this course will never get stale anyway. I would liken it to a flatter (and probably more challenging) White River.
Cons:
The biggest con has to be the navigation. While they seem to be working on fixing this problem, it still isn't easy for a first time visitor. Putting signs on the tees is a huge help, and having those signs point you to where the next tee will be is as well, but the baskets need to be marked and they need to add tape to point you in the right direction. The few "next tee" arrows scattered throughout the course aren't quite enough.
I never did find the official teepad for 12. My phone wouldn't load the map either, so I just had to throw backwards from one of the teepads for hole 5. Apparently the real hole 12 is much longer than that though.
The map on here needs to be updated. Most of it is accurate, but hole 11 doesn't match what I saw on the course. Maybe that's why I couldn't find 12?
As has been stated by previous reviewers, the rough can be very unforgiving for errant shots or shots off of trees. I nearly lost a disc on two holes, and without a spotter I would have spent a lot more time slogging through the tall grass in search of my discs. These are some of the narrowest fairways that I've played due to the tall grass/rough, with hole 18 probably being the toughest. I understand that 18 can't be mowed and I'm fine with that, but spending as much time looking for discs and teepads as you do playing does start to wear on you.
The river really only comes into play on one hole, and that's a super easy RHFH mid-range shot. I was hoping for a hole like number 13 at White River that you dread every time that you play it, but then celebrate every time that you survive.
Other Thoughts:
Based on the marking on the pavilion, this is in a flood plain. I'll also assume that this is the case because many of the baskets near the river (like 8, 9, and 10) are on stands and chained to trees rather than being cemented into the ground. This isn't a con because I'm sure that flooding is a rare situation, but it needs to be mentioned that it can happen.
Hole 1 is on the far left of the open area you'll see on your right when you pull in. Look for the pavilion and then just look to the left of it. You'll see two benches and tee signs. One of those is hole 1.
A kiosk with a map really needs to be installed somewhere. The pavilion looks like it will have one, but it doesn't. There should also be a "lost discs" box somewhere. Any course with this much lost disc potential should have one.
Pay extra close attention to the tee signs. It helps a lot to memorize where the next tee will be based on the arrows on the signs.
While this course is a good drive from Seattle, it makes for an enjoyable round. I won't necessarily become a regular here, but it is absolutely worth a return trip... With a spotter and bright discs.