I used this thread's ideas and looked in surrounding areas for routes. I haven't been on any of the "Untested" routes, I used google maps to route out interesting roads.
The Stanley -> Porteau via Marine Dr is a great run. Marine Dr. is tight tho.
Stanley Park -> Lighthouse Park (Optional) -> Whytecliff Park -> Porteau Cove (Tested) 45km:
https://www.google.com/maps/d/u/0/vi...gGEeqF0owummY4
Highway Loop 50km (Untested)
https://www.google.com/maps/d/u/0/vi...FMlfDV_SzQcmYE
Belcarra Day Trip 20km (Tested)
https://www.google.com/maps/d/u/0/vi...lA1a8LPupoSLak
Mission Run 2.0: ~38.5KM (Untested)
https://www.google.com/maps/d/u/0/vi...ZqKki5K_5TM03M
Whytecliff ONLY 15km (Tested)
https://www.google.com/maps/d/u/0/vi...SmxrM2e9-JUdWU