wow, no responses. I wish I could give in-sight on more of these but I don't know anything about any but Skyline.
Skyline is my favorite course I rarely play. As a fun and challenging course I think it is better than Golden Gate or Stafford Lake and most locals would look at me like i'm an idiot for that. It may be more fun to play regularly than a one time through though.
Every hole has a left, right, short and Long position, with a few like most courses staying either short or long for most of the time except a tournament. It really requires a great variety of shots. It also as many courses in this area not good shots can be punished with roll-aways, deep brush and or poison oak.
It is a very difficult course to play blind the first time, and I don't know at all how busy it is right now. Usually weekends you could meet and play with friendly people but middle of the week has been normally difficult. A handful of blind holes might be worth skipping solo 1st time, you will know them when you get to them. 6 and 14 are probably the most likely to lose a disc on the course.
I love the course, and as I said I don't play there near enough, Napa is a bit of a pain to get to sometimes. Its a great course but finding a partner/group helps there.