To everyone saying "but he said the most attractive girl ever:"
He said it would be the nicest powder ever, so you can't say there will be more powder days like it.
Also, you have to consider that just because a girl is super-attractive, she isn't necessarily a great lay. Conversely, because the powder is the nicest ever and you are "in the mountains," you are guaranteed a great day of skiing.
Sex with a hot girl who may be awful in bed or my best day of skiing ever? I'll take the pow day, please.