Replying to 1 day tour of whistler

OK I'm gonna be at whistler/blackcomb for one day just before christmas. I know, one day sucks, but one day is better than no days. And I've never been there before. so what should I do? Should I just stick to one mountain? whistler or blackcomb? what lifts have good terrain and not much lines? where is good if there isn't much snow? I know nothing but I want to make the most of my one day, so any advice is good advice. unless its shitty advice then that just sucks.
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I'm not made of rubber. I can't lick my elbow :(