Hidden Lake is a fabulous retreat center very close to Portland where we went for several retreats.  Judith and Lauri make sure everyone's really well taken care of. We even had a day retreat for all of our teachers and staff at one time. The property sits on the edge of a small lake. There's even a canoe to take for a ride... Adorable. 
They only cater to groups under 6 now, so that's why we are not choosing this lovely place. Perfect for a personal retreat!