What is Reddit's opinion of Guide to Climbing and Hiking in Southwestern British Columbia?

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Definitely no trail. Has probably been done by a few hardy souls over the centuries. Guy Edwards and some companions skied from Vancouver to Alaska. Climbing and Hiking in SW BC might have some historical information. But it would be a rugged and challenging route, bushwacking through some thick brush and steep mountains.

If you look on google maps though, there are roads leading north from Stave Lake. You could follow those, then climb over a mountain range into the upper Pitt River. Soak in the Pitt River hot springs, then up the back of Mamquam mountain, over to Opal Cone, around the North side of Mount Garilbaldi to Garibaldi Lake and on to the Helm Creek trail around the North side of the Black Tusk and down to Cheakamus Lake and you're just outside Whistler!