YA thats a long drive for shure. May i suggest riding just north of there Taylor basin or Slim creek (gas drop and guide recommended) accomadations at morrow chalets or tyax resort
buddies ran slim creek 2 years ago said Wicked, 450kms in 2 days not a soul nor a track around. never talked to anyone thats riden taylor basin but the pics on the tyax site make it look good. wanted to rent morrow chalets last year and ride there but i was out voted. buddy rented the chalets this year for atving,the small one. said they where great. price was good beautiful inside. maybe look into those spots, there basically north of whistler.
just a thought