Nicole and I are thinking of doing a century ride so we went on a good ride yesterday afternoon. It has a little of everything some nice flat stretches, steep hills, nice vistas, good down hills, bike lanes the whole way, even time to think about your ancestors as you ride through the cemetery. A good bonus is if you do it during the rose festival at the halfway point you can snag some free treats on the waterfront park.
The only negative was we had to bike through some "gray water" in the homeless district of Portland.
The map doesn't show the springwater corrider that we followed along the willamette river or the trail through Tyron Creek Park but it gives the general direction we followed.