Seatac is a great technical course. The neighborhood is just a little rough. (Almost hit a bum with a forehanded firebird on hole 13 once. He was sleeping on the left side of the fairway.) Lakewood is a fun "park" course and it's literally minutes from Seatac. White River just a little south in Kent is a pretty cool course, almost jungle like. Those were three of my favorites from my extended visit last year.
Unfortunately I didn't make it over to the peninsula but whenever I make it back out that way that'll be my main stop. Want to hit up Olympic NP and all the great courses on that side of things.
Lots of great locals. I was lucky to get to play with a handful of them. Sillybizz, drkstr, and KnarfKS were all awesome dudes who I had a great time throwing some plastic with.