Pros:
This is one of the best courses I've played in California, and also one of the most picturesque. It is situated along the north side of the mountains on the southeastern edge of Napa Valley in Skyline Wilderness Park. It is amazing that a course this nice can be found in what is truly a wilderness area (they say there are mountain lions, bears, etc. on occasion). We saw all sorts of wildlife, I paused several times while teeing off for a herd of deer to cross the fairway.
The landscape is classic rolling California hills and valleys, with varying degrees of chaparral and some larger trees along creeks. Old stone walls from the ranchero days can be found along some sides of the course.
There is a good amount of topography on this course, and the design makes great use of these features. One of my favorite holes played over a valley that sloped steeply to the left...if you throw right-hand backhand and the disc stalls out too early, it'll fade all the way downhill and you'll have a descent/climb to retrieve your disc.
Some holes are grassy fairway lined with small trees and shrubs, some play over wide-open valleys, and some play over shrubs and small trees. There are both right and left turning holes, and quite a few are blind (i.e., no view of the basket from the tee).
The rubber tees are very nice, the foundations flat and stable, and the signage is great. Brooms are ubiquitous for sweeping, which is often needed. If you set a fire, extinguishers are available for you to put it out before it burns the whole place down.
At the entrance gate to the park (where you will pay a park-use fee) you can borrow/rent discs. they also seem to have a last-and-found collection there, but I'm not sure how it works.
Cons:
The hike to the course isn't long or difficult, but it also isn't very scenic until you get to the course itself. (Really this isn't a con so much for me, I like to loosen my legs with a walk after driving in the car, before playing a round.)
It would be nice if they could put a small bathroom/toilet out there some where for the ladies, maybe next to the incoming trail near #1.
Other Thoughts:
When we were on on the course, we really felt like we were well-secluded from the rest of the world. This is a very nice feeling on such a beautiful course.
There are a lot of opportunities to lose your disc if you are throwing long into blind areas...maybe get your partners to spot on some of the holes.