We like to stay at Fish Mill Lodges in Westlake. They have some nice cabins, a small RV park, boat ramp, etc. Across the lake are Nightingale's, but it's a pretty good haul to get there, and Ada is farther yet. The wind always seems to be blowing at Ada.
I believe the state record coho came out of Siltcoos.
Anyway, Fish Mill Lodges has a web site:
http://members.tripod.com/~fishmill/homepage.html
It's hard to beat the perch fishing there in the fall. Best luck we've had is the arm by Nightingale's, catching perch and catfish. Wherever you stay, you should have a good time.
John