First, learn about martinis. Then pick a night, mid week is usually best when hubbys are off on business, and glass the hotel bars in downtown Portland for the cougar that catches your eye. Don't go too late, 800 to 1100 is your prime time. Pose as a construction worker, airline pilot, firemen, etc. just in town for the night....just about anything more manly than the hipsters they are used to and I think you are golden.
Seriously though...they are getting thick I Oregon. I've seen 4 in the last year all in close range, after not seeing any my first 11 years living in the state. I have never went specifically for cougar, but know a few guys that do. They say that cougar in heat calls work really well. Good luck.