By best route, do you mean roads or backroads?
I have just about all of the BC backroads mapbooks and parts of Alberta. I wil help with some planning if you'd like.
On weekend trips we've made it as far as Gold Bridge and Bralorne with very minimal pavement driving. This is near Carpenter Lake, BC. I am sure there are other backroads up and over the mountains from there to Prince George as well. Taking Highway 97 all the way up wouldn't be much fun I don't think...
The sea to sky is rather scenic, but for that leg I would highly recommend the Harrision lake forest service road. This will take you from Harrison, east of Vancouver in the valley, all the way to Pemberton. The Harrison route will be just as scenic, with some great wheeling, and no pavement.
It's doubtful I could get much time off to make it to Prince George with Ouray already planned, but I might be able to get a long weekend and go as far north with you guys as possible...
You won't regret wheeling in BC. Colorado reminded me a lot of home...
