Pros:
Worth the drive to see the Olympics over one of the most well hidden State Park Lake fronts in Washington State. The course circles around a huge field, and enters and exits the surrounding forests. Two tee placements for 9 object posts makes 18 holes. The course is well maintained for for having no baskets yet. Very friendly locals. This course has the potential to be a destination course.
Cons:
This course has been here for over a year, and is still a "trial" course. The lack of permanent tees and baskets are a testament to that. Currently the (newly formed) Mason County Disc Golf Club is drafting a proposal to the State to include a pro-27 permanent course. The new course will utilize the 2/3 of the park most land users do not see.
The large field that the current course wraps around is leased for hay. So, 2-3 months out of the year it becomes a major problem.
The posts are not baskets, so you better be comfortable with your putting accuracy.
Also, the tee areas can get slippery when wet.
Other Thoughts:
The local club has a lot of support from the West Sound Disc Golf Association and Olympia Disc Golf Club. After the State okays the proposal (which is something they want to do- because since the intro of disc golf they've seen the land use, vandalism, and off-roading problems disappear) the club will be holding different fund raising tournaments, including random doubles, BYOP etc. Stay tuned!