I'm a routine bicycle commuter now but not long ago I would prefer to ride midday. Now, with the aid of cycleroute.org 
I relive my favorite climbs.
Whisteria was one of three good climbs on this 18 mile ride I rode often while working for Wyatt Software. Choose mt-bike routing for most accurate route.
Council Crest where I rode 3.3 mile laps after riding a warm-up and later a cool-down to my home in Beaverton. Three extra laps would make this a 24 mile ride. The Fairmont saddle made for just enough variability. Lots of informal competition and great views helped too.
The Malahat is the nickname Bill Pooley borrowed from a similarly straight-up climb on Vancouver Island. I naively suggested the route early in my cycling. We rode elsewhere. Years later I climbed it and had legs to climb Parrot Mt on the way home.
Sauvie Island offered 10 miles of flat riding so long as I crossed the west hills twice. The ride along Skyline made even this worth while.