You'll like them all. At Portland and Waverley keeping the ball below the hole is critical. Green contours flow with the lay of the land, so looking at the overall hole will tell you where the percentages are. Greens are also small, usually about 5000 sq ft,poa annua and probably aerated a week ago.
PGC - #3 keep right, #9 look at green before you tee off, front right trap on 14 is well short of green.
Waverley tough greens- 1,2,3,6,9,11,12,14,15. Finish with back to back 5 pars.
Columbia-Edgewater - Hope the Air Force doesn't scramble fighters. Used to have the highest percentage of single digit players in the US. Very few straight holes, best bet is play to the outside. Average greens except for #8 (if #1 is a par 5). #16 voted among best 4 pars in Oregon. Read recently that 8 and 18 will be rebuilt. Back 9 is a counterclockwise circle around perimeter of course, OB left.
Royal Oaks is the hidden gem with a great set of greens.
Nothing spectacular but nothing easy either. #8 hit the right tier. #13 play left on second shot. Squirrels for tee markers.
PGC has held the '47 Ryder Cup and I think Arnie won the US Senior OPen, Lanny Wadkins won the US Amatuer at Waverley, where Tiger also claimed his 3rd US Junior.