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As mentioned, get a tent and camp, this is what I did durring my summers in Whistler. Plenty of semi and legit campsites in the whistler area. Showering can be done (for a small fee) at the rec center.
Or better yet meet a nice Aussie in the village and shack up with her for the night.
Try the UBC lodge its a hostel not to far from the village, I stayed there for a few weeks and it was pretty chill. But if only for 1 night and your really trying to save money sleep in the car, or tent it.