may be it's a completely different experience on 2-wheels, but the duffy lake loop in a car is overrated IMO
Lillooet is bland and ugly
only real highlights past sea-to-sky are pockets between whistler and duffy lake and short stretches of the fraser canyon
haven't explored many BC roads but I like hwy 4 on the island to ucluelet/tofino
some of my favourites outside of BC
Zion Mt. Carmel, Utah
Esterel Massif, France
Taroko Gorge, Taiwan