I worked out a nice, flat little loop ride yesterday -- out the Springwater Trail, south through Boring, then Bakers Ferry, and the surprisingly rocking Clackamas River Road. The weather was crappy, although it never rained, it was chilly and windy. I really tried to talk myself out of going but I have been holed up in the basement working so much lately that I really needed to get out. This route is kind of a softball, but there are several long stretches with low traffic and no stops, so it's great for just hammering.
Clackamas River Road was the highlight -- it's a little under 10 mile stretch of fast rollers and curves with hardly any traffic. A steady 22MPH can be done with a small effort, even with the wind in your face. Super fun.