Ca - Squaw, Kirkwood, Alpine -epic terrain, kirkwood is sick on pow days, Squaw has some of the best terrain around and a great park, the Munchkins, accessable from alpine is THE sickest terrain in tahoe, gotta hitch a ride from the bottom of Alpine Meadows drive tho.
Or- Bachelor - Awesome trees, The Cirque is sick, normally a bad ass park
Ut- Alta/Snowbird, Brighton - Brighton is the most overlooked in utah, not nearly the crowds, but still has dope terrain
Co- Telluride, Silverton - t-ride just opened up a new lift that services maybe colorado's most popular AT terrain, huge bowl, super sick. Silverton one lift true backcountry, bus comes around and picks u up at the road and brings u back to the lift.
Wy- Jackson, need I say more
Some freshies at any of these will make your trip unforgettable, have fun bro.
P.S. for my senior trip I went to Alta, got dumped on to the tune of 8+ feet in a week, they called it the storm of the century. I hope you get the same experience, espically if you come out my way (ca).