Look for them this winter at ter-rain park hot spots like Park City Mountain Resort in Utah , ( 435 ) 649-8111 , www.pcski.com ; Mammoth Mountain Ski Area in California , ( 800 ) 626-6684 , www.mammothmountain.com ; and Heavenly Mountain Resort in South Lake Tahoe , Nev. , ( 775 ) 586-7000 ; www.skiheavenly.com .