Liftopia Entices Skiers and Boarders to Join in "National Play Hooky & Ski Week" With Exclusive Lift Ticket Deals, up to 84% Off SAN FRANCISCO, CA--(Marketwire - Feb 20, 2013) - Who needs an official holiday? The second annual National Play Hooky & Ski Week is Mar. 4-8, and Liftopia -- the largest online marketplace for...