End of March at LL will be great, particularly mid-week. No real crowds to worry about, and the snow will be good unless a freak rain storm or melt/freeze hits. But I think you do have to pay full pass price, even if just using the magic carpet. If it is spring conditions, just don't go super early. And if you are staying in Canmore/Banff, might be a worth a day at Norquay. Good kids skiing off of Cascade.
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